Waterproof pH Meter and Thermometer | Cheese Supply Co.
Amazon.com: VIVOSUN 3-in-1 Digital pH Meter with ATC, ±0.1 pH Accuracy Water Quality Tester, 0-14.0 pH Measurement Range for Hydroponics, Household Drinking, Pool and Aquarium : Industrial & Scientific
Always in Stock - Oakton PH 550 Benchtop pH Meter Kit from Cole-Parmer
Insten - Digital Ph Meter Tester Pen For Water Hydroponics, High Accuracy, Pocket Size, 0-14 Ph Measurement Range : Target
$701.50 - Thermo Scientific Orion LSTAR1115 Benchtop pH Meter Standard Kit