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$53.90 Shipping Condition: New Location: China Model 600 stirring rack. ℃ and ℉ can be switched freely. pH buffer solution. Input resistance. No(optional). temperature electrode. 201T-M plastic pH/ATC ... morethree in one combination electrode. pH electrode.
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$45.00 Shipping Condition: New Location: China PH Range: -2.000~16.000pH. pH Accuracy: ±0.01pH. mV Range: 0~±1999mV. mV Accuracy ： ±1mV. Per the slope value, you decides whether to change the pH electrode. ... moreUSA or NIST pH standard buffer. Using the supplied temperature probe, the temperature value is displayed on the screen.
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Free Shipping Condition: New Location: Bell Gardens, United States The upper limit of a prism is as high as 20delta. LM300 is equipped with automatic identification system. Automatic identification of lens type. We have ... moretwo colors, the back of the machine is black, and the back of the machine is white.
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Free Shipping Condition: New Location: Evanston, United States ✔LARGE CAPACITY - 2000mL vacuum filtration apparatus is designed by JoanLab®, sold by Fristaden Lab. The filtration apparatus is manufactured from high-quality ... moreborosilicate glass. The unit weight and height are 1500g and 465mm.
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Free Shipping Condition: Used Location: Addison, United States Large color TFT display is easily visible, and features a stability icon to alert you when your readings are ready to be recorded and an electrode health ... moreicon indicating when you need to refill or replace your electrode.
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Free Shipping Condition: New Location: United States Light Industrial. & Recepticles. Electrical Outlets. and Enclosures. Electrical Boxes. General Purpose. & Industrial.
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Free Shipping Condition: New Location: New Bedford, United States Thermo Scientific Orion Star A211 pH Meter w/Electrode Holder, Arm, Meter BracketPROBE NOT INCLUDED
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$12.90 Shipping Condition: For parts or not working Location: Houston, United States Function: This item is for PARTS/ REPAIR. Unit has been basic power tested ONLY, and. No exceptions. Sorry, no other parts, wiring, or accessories included.
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Free Shipping Condition: New Location: China 1 x PHS-3C pH Tester Tool Kit. Accuracy: pH: ±0.01; mV: ±0.1%F.S. Display: 0.01pH, 1mV, 0.1℃. Manual temperature compensation range: 0 ~ 60℃. Model: PHS-3C. ... moreThe manufacturer does not necessarily endorse use of these products.
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Free Shipping Condition: Used Location: Des Plaines, United States
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$15.00 Shipping Condition: New Location: Wilmington, United States Model: 30100424. Order No: 30100424. Keep pH levels constant with the Ohaus 30100424 pH Buffer Solution. The buffer can be used to maintain pH at a consistent ... morelevel. Solution Type Buffer. Application(s) pH testing.
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$30.57 Shipping Condition: Used Location: Temecula, United States Range - pH -2.00 to 16.00 pH; -2.000 to 16.000 pH. Resolution - pH 0.01 pH / 0.001 pH. Accuracy - pH ±0.01 pH / ±0.002 pH. BNC Inputs 1 for pH electrode. ... morepH Electrode HI 1131P, glass body, refillable, BNC + pin connectors, 1 m cable (included).
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$22.00 Shipping Condition: Used Location: New Ipswich, United States
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$10.00 Shipping Condition: New Location: United States Denshine AAAAA High Speed Handpiece Large Torque Push Button 4Hole New. Denshine golden ceramic turbine LED light High Speed fast Handpiece Standard 2H. ... moreDenshine Pro Autoclave Dental Composite Gun Dispenser Applicator for Unidose.
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$33.53 Shipping Condition: Used Location: New York, United States PH Sensor for use with Vernier LabQuest systems. From Vernier's website Typical activities using our pH sensor include Monitoring pH change during chemical ... morereactions or in an aquarium as a result of photosynthesis.
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Free Shipping Condition: New Location: Mission Viejo, United States Large LCD display & adjustable stand-alone electrode holder. Multiple connectivity capabilities include RS232 & USB interface. Accuracy: ±0.5 °C; ±1 mV; ... more±0.01 pH. pH accuracy (±): 0.01. Display: LCD with backlight & one-line dot matrix.
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$63.80 Shipping Condition: New – Open box Location: Milpitas, United States Adjustable stand for your convenience and space usage. • New designed stand can be used as probe position tool: you can move the probe vertically perfectly; ... morevery conveniently for you to move in/out the probe from the liquides, and to position the probe to the exact location.
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$15.70 Shipping Condition: Used Location: Canada
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$17.95 Shipping Condition: Used Location: Saint Paul, United States Manufacturer : Corning. Ranges: 0 to 14 pH, -999.9 to 999.9 mV, 0 to 100. Resolution: 0.01 pH, 1 mV, 1. W orking Condition: Ranges: 0 to 14 pH, -999.9 ... moreto 999.9 mV, 0 to 100oC. No further tesing has been done.
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Free Shipping Condition: New Location: China A convenient tool to test water pH and chlorine for swimming pool and spa. You need to prepare 1.5 PPM of chlorine solution in the pool water for. Easy ... moreto operate, you can quickly test whether chlorine and PH are in the ideal range.
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Free Shipping Condition: For parts or not working Location: Norwalk, United States You should not use this information as self-diagnosis or for treating a health problem or disease.
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$19.90 Shipping Condition: For parts or not working Location: Rochester, United States Model: 130. SOLD AS IS. This unit is exactly as pictured. Item specifications.
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Free Shipping Condition: New Location: China Quantity: 100pcs. pH range: pH 0-14. 12 months Warranty. If item is defective after 3 months, you can still send it back to us. We will send you a new ... moreone after receiving the defective item. Mon. to Sat.
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Free Shipping Condition: New Location: China Quantity: 100pcs. pH range: pH 0-14. Use: acid and alkali test. 12 months Warranty. If item is defective after 3 months, you can still send it back to ... moreus. We will send you a new one after receiving the defective item.
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$32.42 Shipping Condition: Used Location: Derwood, United States
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$89.72 Shipping Condition: Used Location: Phoenix, United States Orion 3 Star. 927005MD Star ATC and 8102BNUWP ROSS Ultra Combination pH. Serial Number Bright LCD display with ready indication Convenient built-in Quick-Start ... moreGuide. Specifications are from manufacturer and may vary slightly due to upgrades, options, or revisions this unit may or may not have.
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Free Shipping Condition: New Location: Victor, United States Product Details. Product TypeScience Lab Education Curriculum Support. 0 - 3 V, 0-15 V, 0-30 V. Economically priced.
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Free Shipping Condition: Brand New Location: Victor, United States This unit demonstrates the concept of a resistance. Fitted with three 1W resistances of different values. Can be used inline with other components of ... moreEisco Series PH1029. CE Certification. Can be used inline with other components of Eisco Series PH1029.
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Free Shipping Condition: New Location: China Can display PH, temperature value or mV, humidity value. Resolution: 0.01pH, 1mv, 0.1°C. Basic error of electronic unit: pH0.01pH; mV0.1% (FS). Electronic ... moreunit repeatability error: pH0.01pH; mV1mV. Manual temperature compensation range: 0-60°C.
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$150.00 Shipping Condition: For parts or not working Location: Brookline, United States This is a store listing for Accumet Research AR15 pH Meter With Probe Holder What you will get: Accumet Research AR15 pH Meter With Probe Holder Power ... moreAdapter. The Fisher Accumet AR15 pH meter measures pH and mV with all the power of the top-of-the-line models. This meter offers an extended pH range(2 to +20) With resolution adjustable to 0.001 and calibration on up to five points for exceptional accuracy(+/0.002) The AR15 automatically recognizes U.S. Euro, NIST or even custom buffers. And, just like other AR models, features microprocessor control, 250-point data memory with battery backup, self test on power-up, auto or manual temperature compensation, programmable alarm, and data storage/output either on demand, when stable, or according to timer. The touchscreen interface allows an unparalleled range of user-determined setup, screen display, data storage and printing options. And, a wealth of plain-language prompts, help screens and error messages make operation easy, even for inexperienced operators. I tested this and the display and touch screen have no issues. If you need one of these for parts. Check my as I have another one of these where the touch part of it is nonfunctional. Screen is good as well as the backlight. And also in the store are 2 more of the Accument AR15 pH meters without the probe holder that are fully functional. Free shipping in the USA International Buyers. Please Note: Import duties. Taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying. These charges are normally collected by the delivering freight(shipping) company or when you pick the item up do not confuse them for additional shipping charges. We do not mark merchandise values below value or mark items as"gifts" US and International government regulations prohibit such behavior. Powered by The free listing tool. List your items
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Free Shipping Condition: New Location: Minooka, United States Store Categories. Click to close full size. For warranty information. YSI 3824. Buffer Package, pH, 4.0, 7.0 and 10.0, 1 Pt. YSI. Item Specifics. Item. ... moreBuffer Package. Type. PH. Item. Buffer Package. For Use With. YSI Professional Plus Multiparameter Meter. Container. 1 Pt Bottle. Range. 4.0. 7.0 and 10.0 pH. Type. PH. Package Quantity. 1. Shipping A $5 shipping and handling fee is charged on orders totaling less that $25 before tax and shipped to one address within the continental United States. No shipping and handling is charged to customers for standard ground delivery on orders of $25 or more before tax. Not all products qualify for the above Shipping Policy. Additionally. Standard shipping rates will apply for all orders to Alaska and Hawaii. Any charges incurred for hazardous materials or other special handling by the carrier must be paid by the customer. Fuel surcharges may be applied. Returns If you are not satisfied for any reason products may be returned within 30 days of shipment for a full credit or exchange(provided the product is undamaged) Return documentation should clearly specify credit or exchange. Returned items must be in the original packaging. All returns must include a return authorization(RA) number that can be obtained by contacting our Customer Service Department at 855-BUY-ZORO(855-289-9676) Our customer services hours are Monday through Friday from 7am to 7pm(central) Include a copy of the original order confirmation or packing slip with your RA paperwork as proof of purchase. Returns received at Zoro without a RA number may be assessed a 15% restocking(processing) fee that will be deducted from any credit due. About Us Zoro has a simple mission. We help small business stay competitive! We do this by offering great products at super prices. We understand the importance of saving time and keeping costs low. Businesses like yours and ours have historically been at a disadvantage to larger companies who can buy stuff at lower prices because of their size. We want to change t
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Free Shipping Condition: New Location: Mission Viejo, United States The ST400 features intuitive software which guides the user through operation. All necessary information to run tests successfully such as electrode condition ... moreis displayed clearly on the large LCD. Accuracy: ±0.01 pH;±1 mV;±0.5 °C.
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Free Shipping Condition: New – Open box Location: Delta, United States Model:PHE 54473. Gage Valves. Line Reactors. Solenoid Valves. Solenoid Coils. Shock Absorbers. Safety and Security. Rotary Lobe Blowers.
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$18.23 Shipping Condition: New Location: Claymont, United States Set of 3 pH Buffer Solution Powders.
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$29.75 Shipping Condition: Used Location: Williamsburg, United States For sale is a vocational school used lot of 2 Hanna Instruments pH209 Benchtop pH/mV meter pH 209-01 bench top. W/probesStorage Ewhsenwbr pallet rack
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$45.16 Shipping Condition: Used Location: Derwood, United States , BNC connector. Lot bsmfarsh.
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$24.75 Shipping Condition: Used Location: San Diego, United States Mettler Toledo SevenMulti-Conductivity/ pH Meter-Used with normal cosmetic wear and tear(please see photos) Sold"without" electrodes-Comes with ... morepower supply(not pictured) Fully functional and in good working condition. 14 day right of return Return Policy-14 Day money back returns policy. Buyer pays return shipping. Buyer must initiate any returns within 14 days of receiving delivery. Shipping Information- Will Only Ship To Confirmed Addresses-Ships by UPS Ground Service. Will ship out within 2 business day once payment has been received- Any variations(residential delivery. Ground level delivery etc. must be discussed prior to purchase and may result in additional shipping charges to be the responsibility of the customer.
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$22.00 Shipping Condition: For parts or not working Location: Israel FDA required notice: The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies.
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Free Shipping Condition: New Location: Top Khana Bazar S.O, India We offer a wide range in Photo Colorimeters. Which come in the best designs for an easy usage. The accuracy given by these products in blending along ... morewith the easy handling gives it the best results. These are capable for analyzing any level of concentration of a solution. These products are well tested on strict industry parameters by the team of experts to give absolute accurate measurements. The best quality raw material used in the manufacturing gives unmatched endurance. Features Easy operation Rugged and reliable Durable photo diode detector Sample size of 1 ml Wide range of in-built filters Wavelength from 400nm to 700nm Rotating disc for filter setting control Automatic shutter to prevent photocell fatigue Light Source: Refocused tungsten lamp Applications Textile Iron& steel Cement Hospitals Dairy Chemical Chemical& labs Biotechnology Fertilizers Food& beverage Agriculture Aqua culture Specifications. Model, SI-127 Digital Model, Std. Glass Filter, 8, Mini Volume, 1 ml. Display, 2 ½ Digit LED, Range, 400-700 nm, Output OD, OD(0 to 1.99) Keyboard, Manual Key, Auto Zeroing, N.A. Transmission, Resolution, OD: 0.01, Accuracy, 0.5% FSI, Detector, Photocell/ Photodiode, Light Source, 6.8v. 300mA, Power, 230v ± 10% 50 Hz with in-built stabilizer. Dimension& Weight Accessories, L 230 X B 185 X H 105mm. 3 Kg. Approx) Test Tube set of 5, Spare Lamp, Dust Cover, Manual, Filters, 8 Filters- 400. 420, 480, 500, 520, 540, 620, 680 nm Shipping is FREE in US by EMS which takes 3-4 weeks to deliver All Items are Shipped from INDIA If you opt for FREE Shipping. Tracking if available for your country will be provided and you will be responsible for the shipping time so we would like a 5 Star feedback on shipping Time. Expedite Shipping option at a nominal cost by DHL or Fedex is also available which will deliver within 5 business days and confirmed Tracking is provided International Buyers might have to pay Import Custom Duties/Taxes so are advised to check the same before Purchase PayPal is Accep
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Free Shipping Condition: New Location: Farmington, United States Item - Buffer Solution. Concentration - pH 4.0. Type - pH Standard, Color Red. Container Size - 4L. Chemical Grade Lab Chemical. Item(s) described above ... moreand exactly what's pictured.
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Free Shipping Condition: New Location: China Can display PH, temperature value or mV, humidity value. Resolution: 0.01pH, 1mv, 0.1°C. Basic error of electronic unit: pH0.01pH; mV0.1% (FS). Electronic ... moreunit repeatability error: pH0.01pH; mV1mV.
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Free Shipping Condition: New Location: Hatfield, United States The finished product is assigned a unique Lot number and expiration date. These products will have greater than one year shelf life when received. Convenient ... moreWaterproof Labels.
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$19.26 Shipping Condition: Used Location: Crestline, United States Click to Enlarge) Product ID# R113527 This Orion Research LOG R Compensator Model 611 Digital pH/Millivolt Meter to be in good cosmetic condition with ... moresome signs of prior use or wear. It powered on as shown by the photos above. However. I lack the knowledge or equipment to test it further, so due to little testing, it is being sold as-is. Please see photos for more detail. There is a small amount of sticker residue. Items comes exactly as shown in the photos above. No other accessories are included. If you do not see it in the photos. It is not included. Unpacked wt. and dims are 13" x 8" x 4" Please ask questions or indicate concerns prior to bidding. By placing a bid. You agree to all stated terms.All auctions are sold as advertised, as is and without warranty, unless otherwise stated in the item description. See additional terms of the auction below Shipping. Buyer pays a fixed shipping and handling fee of 24 dollars(for DOMESTIC shipments only- 48 contiguous states excluding Hawaii and Alaska) All international shipments(including Hawaii and Alaska residents) will be quoted based on winning bidders shipping address. The unpacked weight of this item is 10 pounds Orders will ship 1-2 business days(excludes weekends and holidays) after receipt of confirmed/verified Paypal payments.We do not process orders nor ship on weekends or holidays. Auction Terms. Upon end of auction. The winning bidder should proceed to"CheckOut" and will be redirected to our Auction Checkout Page. WE DO NOT TAKE CREDIT CARDS(except through PayPal) All auctioned products are sold as advertised. As is and without warranty. Questions should be asked prior to bidding as all sales are final PAYMENT TERMS ARE PREPAID ONLY. Payments. ALL AUCTIONS ARE PREPAID ONLY. We accept Paypal payments that are US and Canada Verified with ship-to US and Canada confirmed addresses only. We accept credit card payments through confirmed/verified Paypal accounts only. California and Texas Sales Tax For all California ship-to locations w
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Free Shipping Condition: Used Location: Mountainair, United States RADIOMETER COPENHAGEN PHM 84 RESEARCH PH METER Description: Thank you for your interest! We are auctioning off this RADIOMETER COPENHAGEN PHM 84 RESEARCH ... morePH METER. Acquired from government surplus. As you know with most government agencies. When a new grant comes in, they have to justify the grant by buying new equipment leaving very useful equipment for surplus. COMES AS SHOWN! Some cosmetic wear. Powers up. The plastic in front of the display is cracked. USA CUSTOMERS- NO MEANS TO TEST. May have other unknown issues. Sold as is for parts or repair! INTERNATIONAL CUSTOMERS- NO MEANS TO TEST. SOLD AS IS WITH NO GUARANTEES. 1. All equipment is sold-as-is. We are surplus equipment dealers and do not have the ability or knowledge to test equipment for functionality beyond plugging it in and describing what we observe as best we can. 2. All statements regarding products and their configurations are made to the best of our ability and with the assumption that the buyer is knowledgeable and proficient in the use of this type of equipment. 3.We have no knowledge of the history of the equipment. Due to the nature of used and surplus equipment no guarantees or warranties either expressed or implied are offered unless specifically noted in the description. 4. NO REFUNDS OR RETURNS will be allowed. No exceptions unless offered in the description. 5. No manuals.NO STANDARD POWER CORDS, accessories, software etc are included unless pictured and noted in the description. 6. It is the bidder's responsibility to understand that the terms of the auction. The nature of equipment offered and bid accordingly. Shipping: BUYER TO PAY SHIPPING IN THE US. Alaska& Hawaii will be more! INTERNATIONAL BIDDERS WELCOMED-PLEASE CONTACT US FOR ACCURATE SHIPPING CHARGES Payment: Gladly accept most forms of payment including paypal click to Enlarge click to Enlarge inkfrog terapeak. I000000. InkFrog Analytics.
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Condition: Used Location: Elkin, United States ((InvIDs))349020(((InvIDs))). North Carolina 7.00%. Phone: (410) 782-0444. "The sale of this item may be subject to regulation by the U.S. Food and Drug ... moreAdministration and state and local regulatory agencies.
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$45.16 Shipping Condition: Used Location: Derwood, United States Lot bsmfarsh.
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$18.46 Shipping Condition: New – Open box Location: Oregon, United States Connector OAKTON Connector. Range 0 Degrees to 80 Degrees C. If it is not possible we will work with you to resolve the issue. We have inspected this ... moreitem and we do not have the capability to install the unit to fully test it.
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$100.40 Shipping Condition: For parts or not working Location: Rochester, United States Thermo Electron Orion 3 Star Portable pH Meter Unable To Test. Condition is For parts or not working. Shipped with USPS Priority Mail.
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Free Shipping Condition: Used Location: Phoenix, United States
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$7.90 Shipping Condition: New Location: Vincentown, United States Printed on each sachet is a pH / C chart as well as a lot # and expiration date. Available individually in sachets. This buffer is an aqueous solution ... moreof sodium hydrogen carbonate and sodium carbonate.
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$30.57 Shipping Condition: Used Location: Temecula, United States We are not a party to any manufacturer's warranty that may or may not apply.
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$15.01 Shipping Condition: For parts or not working Location: Fresno, United States Used very little. Practically Brand new.
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$80.00 Shipping Condition: Used Location: China THERMO SCIENTIFIC ORION STAR SERIES pH BENCHTOP METER MODEL: ORION 3 STAR UNIT IS BEING SOLD AS IS FOR PARTS OR REPAIR BECAUSE IT DOES NOT POWER ON. UNIT ... moreIS USED AND HAS SOME SCUFFS AND SCRAPES FROM NORMAL WEAR. AUCTION DOES NOT INCLUDE POWER ADAPTER OR ANY OTHER ACCESSORIES. ONLY WHAT IS PICTURED IS INCLUDED IN AUCTION. UNIT IS BEING SOLD AS IS. NO RETURNS ACCEPTED. PAYMENT We accept payments in US Dollars through Paypal Please allow extra days to clear the fund if you pay by an eCheck If you prefer to pay with a Visa. Mastercard, or American Express card please contact me after the auction ends We will hold your order pending receipt of your payment for up to 3 days if no immediate payment is required If the payment is not received in 3 days the sale will be cancelled and the item will become available for sale WARRANTY AND RETURNS We guarantee our items not DOA unless otherwise stated in auction. We ask that you please contact us first if you would like to return a purchase. If you have any issues or concerns with your purchase please contact us. We will do our best to make it right. Returns for defective items are accepted within 14 days of receipt. We offer an exchange or money back. Shipping for returned items that are not defective is the responsibility of the buyer. We ship exactly as described in auction. If manuals. Software, packaging etc. are not mentioned, they are not included. Returned items must be in the same condition as they were shipped. SHIPPING We ship 1-2 business days after cleared payment(excluding holidays and weekends) Shipping is via UPS Ground or USPS Priority Mail If you need a different method of s hipping please contact us before auction ends and we will do our best to accomodate you. INTERNATIONAL BUYERS We ship internationally on a case by case basis. If you are an international buyer please contact us before buying or bidding on any of our items. We will not ship internationally unless we are contacted first. Import duties. Taxes, and charges are not included in the item pr
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$7.96 Shipping Condition: New Location: Scottsdale, United States PH: 0 to 14 pH 0.01 pH ±0.02 pH. mV/ORP: -999 to 999 mV 0.1 mV (-199.9 to 199.9). otherwise 1 mV ±0.2 mV (-199.9. Also accepts any pH or ORP probe with ... morea standard BNC connector. otherwise ±2 mV. Mode: Range: Resolution: Accuracy ).
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$12.84 Shipping Condition: Used Location: Sanford, United States We do not have any history other than that. Item powers up an changes functions.
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Free Shipping Condition: New Location: Sun Valley, United States Large LCD display & adjustable stand-alone electrode holder. Multiple connectivity capabilities include RS232 & USB interface. pH accuracy (±): 0.01. ... moreAccuracy ± (Temperature): 0.5 °C. Accuracy ± (mV): 1 mV.
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$11.30 Shipping Condition: New Location: Miller Place, United States On Products over $75) Milwaukee Instruments MA9011 pH 10.01 Calibration Buffer Solution. 230 mL New- Registered Distributor- Factory Warranty pH 10.01 ... moreCalibration Buffer Solution. 230 mL. FREE UPS Ground Shipping on items OVER $75 to continental U.S. PO Boxes/APOs require USPS shipping. May experience longer lead times. 6.25% Sales Tax for shipping to Massachusetts(Add an additional $24 for shipments to AK. HI, or PR. Terms and Conditions Have a Question? Send us a message(Contact Seller) We are shipping from just north of Boston. MA in the United States. For international customers, do not assume a product will work in your country due to various International Voltage requirements. Ask first if you are not sure. Warranty: We are an authorized distributor. Item includes full manufacturerÂ’s warranty. International Shipping Terms: International customers are responsible for all shipping charges. Including any duties or taxes that may be enforced by their respective country. USPS is the most economical shipping method for international customers. With this often comes a slightly delayed lead-time or erratic tracking information. We ask for your patience. And we will do the best we can to see you get your shipment quickly and accurately. Feedback: We appreciate your Positive feedback. We leave feedback for buyers as soon as our transactions complete. If you have any problems with the sale. We will do anything within reason to correct or improve your experience. If negative feedback is left prior to an attempted resolution, we reserve the right to accept that as the final resolution. We will not accept a return or issue a refund. Note Estimated Delivery time above. Please contact us if you require specific details. Or have a required delivery date.
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$27.99 Shipping Condition: Used Location: Derwood, United States Lot bsmutshfar.
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$29.99 Shipping Condition: New Location: China PH high limit alarm, low limit alarm dual relay, hysteresis can be adjusted freely. Accuracy: + 0.02 pH; + 1 mV. Resolution: 0.01pH; 1mV. Stability: ≤ ... more0.02 pH / 24 hours; ≤ 3 mV / 24 hours. PH standard solution: 4.00 / 6.86 / 9.18.
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Free Shipping Condition: New Location: Pikesville, United States They are commonly used for water testing, and for biological sample analysis in hydroponics, aquaculture and agriculture. It can be used with Tris buffers. ... moreIt has a protective cap to reduce contamination and a double silicone O-ring for ease of electrode module.
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