Hm Digital

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

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

HM Digital TDS-4 Pocket Size TDS Tester Meter with 0-9990 ppm Measurement Range, 1 ppm Resolution, 2% Readout Accuracy

HM Digital DM-1 In-Line Dual TDS Monitor, 0-9990 ppm Range, 2% Readout Accuracy

HM Digital COM-80 Electrical Conductivity (EC) and Total Dissolved Solids Hydro r, 0-5000 ppm TDS Range, 1 ppm Resolution, 2% Readout Accuracy

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

HM Digital 1000ppm TDS Calibration Solution