ISE/Conductivity Handheld Meter pH Range -2.60 to 16.60 Electric Conductivity Range 0.0 to 200 mS/cm Each Range TDS Range 0 to 100g/L TDS Constant Range 0.30 to 1.00 (0.65 Default) ORP Range -1500 to 1500 mV Waterproof IP67 Automatic Temperature Compensation Yes Displayed Temperature Range -5 Degrees to 55 Degrees C Salinity Range 0 to 70 ppt Operating Temp Range (F) 14 Degrees to 140 Degrees Operating Temp Range (C) -10 Degrees to 60 Degrees C Display Backlit LCD