HM Digital COM-100 Waterproof EC/TDS/Temp Combo Meter Promote Super compact box takes up

Super compact box takes up little shelf space

You don't see them

Most likely you have not

reservoir size of 25 gallons is sufficient for almost any set up

HM Digital COM-100 Waterproof EC/TDS/Temp Combo Meter Promote Super compact box takes upIdeal for all water quality testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more. The COM 100 is a professional level EC TDS meter at an unbeatable price. Measures electrical conductivity (EC), total dissolved solids (TDS), salinity and temperature. UPGRADED: Four scales: S, mS, ppm, ppt