Model?Number:?Water?Quality?Tester DIY?Supplies:?Plumbing EC:?0.00?-?19990us/cm TDS:?0.00-?19990ppm Temperature:?-50-70?degrees(-58-?158?Fahrenheit) Accuracy:?EC:±2%F.S Working?temperature:?0?-50?degrees?(32-?122Fahrenheit) Item?Size:?Approx.?188?*?40?*?40mm?/?7.4?*?1.6?*?1.6in