ModelNumber:WaterQualityTester DIYSupplies:Plumbing EC:0.00-19990us/cm TDS:0.00-19990ppm Temperature:-50-70degrees(-58-158Fahrenheit) Accuracy:EC:±2%F.S Workingtemperature:0-50degrees(32-122Fahrenheit) ItemSize:Approx.188*40*40mm/7.4*1.6*1.6in