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3 adjustable speeds
allowing for remote control
When the oxygen concentration returns to 19
Most models are variable speed capable when used with speed control (sold separately)
HM Digital COM-80 HydroTester Series EC/TDS Meter Fulvic Acid & Humic Acid 3 adjustable speedsThe 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).
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