HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy

General Hydroponics GH1514 Ph Control Kit

Oakton EcoTestr pH 2 Waterproof pH Tester, 0.0 to 14.0 pH Range

HDE Digital pH Meter Tester

HM Digital AP-2 AquaPro Water Quality Electrical Conductivity Tester, 0-9999 μS Range, 1 μS Resolution, +/- 2% Readout Accuracy

Etekcity? PH-009 IA High Quality Digital Pocket Pen Type PH Meter & Digital Tester Hydro New

HM Digital pH/Temperature Meter

BestDealUSA PH-009 IA Pen Type PH Meter & Digital Tester Hydro New

CyberTech PHTester PH-107 Digital pH Meter Tester, With 2 Pack of Calibration Solution Mixture Included.

Hanna Instruments HI 98107 pHep pH Tester, with +/-0.1 Accuracy

Digital Pocket PH Water Meter Tester For Aquarium Pool Spa Wine Hydroponics Test

HM Digital TDS-3 Handheld TDS Meter With Carrying Case, 0 - 9990 ppm TDS Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy

Waterproof pH/Temperature Meter

Extech PH100 ExStik 0.00 to 14.00-PH Waterproof Meter

Waterproof EC/TDS/Temp Combo Meter

Swimming Pool Spa Water Ph/cl2 Chlorine Tester Meter Ph

PHion Balance Diagnostic Ph Test Strips, 4.5 - 9.0 ph Range, 90-Count

Digital PH Meter + 2 Pouches of Calibration Buffer Solution, 0.0 to 14.0 pH Range

HM Digital TDS-4 Pocket Size TDS Tester Meter Without Digital Thermometer, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 2% Readout Accuracy

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