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use these refill plugs to reload your Perfect Plug Tray® brand starter tray
Warms root area approximately 10–20° F over ambient temperature to improve germination process
Excellent for nutrient testing
Derived from: Potassium Silicate
HM Digital™ EC/TDS HydroTester Model COM-80 Cycle Timer use these refill plugs toHM Digital EC TDS HydroTester Model COM 80 The COM 80 is an economically priced, reliable EC TDS meter that is ideal for testing applications such as hydroponics, gardening, pools, spas, aquariums, reef tanks, water ionizers, drinking water and more. Measures electrical conductivity (EC), total dissolved solids (TDS). Excellent for nutrient testing. Four scales: EC: S, mS; TDS: ppm, ppt. This tester has automatic temperature compensation (ATC) and is
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