Hydro Master 200

HydroMaster Portable Combo PH/EC/TDS/Temp: The HM-200 is a versatile portable PH/EC/TDS/Temp monitor 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.