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TDS-3 is the most widely used handheld TDS meter in the world according to HM Digital who holds the original patent for this meter. Beware of
The COM-300 is an advanced waterproof combo meter with superior accuracy. The meter measures four parameters: pH, electrical conductivity (EC), total dissolved solids (TDS) and temperature. Features include 2 different conductivity conversion factors to convert EC to TDS using the 0.5 (NaCl) or 0.7 (442TM), as well as selectable modes for measurements in the μS, mS and ppm scales.
HM Digital COM-300 pH/TDS/EC/Temp Meter
HM Digital TDS-3 & Temp Meter with Case
HM Digital TDS-3 Handheld TDS Meter with Carrying Case
HM Digital TDS-4TM Pocket Size TDS & Temperature Meter - TDS / EC - Water Quality Tester
HM Digital Water Quality Meters - TDS, pH, Conductivity, Chlorine, Temperature, EC – Isopure Water
HM Digital TDS Meter
HM Digital Dual Inline TDS Meter
COM-100: Waterproof Professional EC/TDS Meter
HM Digital TDS Meter mit Thermometer und Ledertasche TDS-3
HM Digital – Fresh Water Systems
Handheld TDS Meters For Testing Water For Total Dissolved Solids