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HM Digital COM-360 model is a waterproof professional grade level pH/EC/TDS/Temp meter ideal for all water quality testings, hydroponics, water purification applications, wastewater regulation, aquaculture, colloidal silver, labs & scientific testing, pools & spas, boilers & cooling towers, water treatment and more.It has a built-in sensor for Automatic Temperature Compensation (ATC) ensures readings always be accurate at various temperatures.