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

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

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

HM Digital HMDCOM100 Waterproof EC/TDS And Amp Temperature Combo Meter

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

HM Digital AP-1 AquaPro Water Quality Total Dissolved Solids Tester, 0-5000 ppm TDS Range, 1 ppm Resolution, +/- 2% Readout Accuracy (Magnetic Body)

HM Digital TDS-4TMA Pocket Size TDS Tester Meter for Freshwater Aquariums with Digital Thermometer, 0 - 9990 ppm TDS Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy

HM ZT-2 TDS Meter Water Purity PPM Tester (BOX OF 20)

HM Digital C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume

HM Digital TDS-4TM Meter with Digital Thermometer

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