HM Digital COM-80 HydroTester Series EC/TDS Meter Fulvic Acid & Humic Acid Most models are variable speed

Most models are variable speed capable when used with speed control (sold separately)

5 and 1 gallons

competitors joints often require tedious manual work post-cycle (hand-packing

2% 2% Water Solulble Magnesium (Mg)

HM Digital COM-80 HydroTester Series EC/TDS Meter Fulvic Acid & Humic Acid Most models are variable speedThe HM Digital Waterproof EC TDS Temp HydroTester (COM 80) is easily the most advanced economically priced, reliable EC TDS meter on the market. With its versatility and durability, it is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more. HM Digital Waterproof EC TDS Temp HydroTester Features: Measures electrical conductivity (EC), total dissolved solids (TDS).