COM-100 COM-100: Waterproof Professional Series EC/TDS Meter The COM-100 is a professional grade level EC/TDS/Temp meter ideal for all water quality testing, hydroponics, water purification applications, wastewater regulation, aquaculture, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more. FEATURES: Measures electrical conductivity (EC), total dissolved solids (TDS), salinity and temperature. UPGRADED: Four scales: µS, mS, ppm 0.5 (NaCl) Scale & 0.7 (442™) Scale Automatic Temperature Compensation (ATC) using three temperature coefficients Waterproof housing (IP-67 rating) Digital Calibration (push button) to any point within the meter’s range Auto-off function, data-hold function and low-battery indicator Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Replaceable Sensor (model SP-C1) Factory Calibrated: The COM-100 meter is calibrated with a 1413 µS solution. UPGRADED: Includes translucent cap, 2 (AAA) batteries and lanyard.