Handheld Multiparameter Meter Kit, pH Range -2.00 to 20.00, Electric Conductivity Range 0 to 200 mS, TDS Range 0.01 to 200,000 mg/L, ORP Range -1000 to +1000 mV, Waterproof IP67, Automatic Temperature Compensation Yes, Displayed Temperature Range -22 to 266 Degrees F, -30 Degrees to 130 Degrees C, Salinity Range 0 to 80 ppt, Operating Temp. Range (F) -22 Degrees to 266 Degrees F, Operating Temp. Range (C) -30 Degrees to 130 Degrees C, Resistivity Range 0.1 ohms/cm to 200megaohms/cm