Always in Stock - Oakton PH 550 Benchtop pH Meter Kit from Cole-Parmer
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pH20 Digital Pocket pH Meter Pen Tester Kit-Apera Instruments
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Advanced pH Meter – Sper Scientific Direct
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The portable pH Meter
Amazon.com: VIVOSUN Digital PH Meter for Water, 0.05ph High Accuracy Pen Type PH Tester for Hydroponics, Household Drinking, Pool and Aquarium : Industrial & Scientific
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Oakton pHTestr 30 Waterproof pH Meter | CHEMetrics
Amazon.com: VIVOSUN pH and TDS Meter Combo, 0.05ph High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Household Drinking, and Aquarium, UL Certified :
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Beckman Model M pH Meter - Science History Institute Digital Collections
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Oakton Handheld pH Meters pH 6+ meter only:pH and Electrochemistry, Quantity: | Fisher Scientific