Check the listing for details. COM-100: Waterproof Professional Series EC/TDS Meter. Condition: New. Listed at 72.99 USD. 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™) ScaleAutomatic Temperature Compensation (ATC) using three temperature coefficientsWaterproof housing (IP-67 rating)Digital Calibration (push button) to any point within the meter’s rangeAuto-off function, data-hold function and low-battery indicatorDisplay: 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.