pH/ORP/Temperature Datalogger pH Range 0 to 14 ORP Range -1999 to 1999mV Waterproof No Automatic Temperature Compensation Yes Displayed Temperature Range 0 Degrees to 65 Degrees C 32 Degrees to 149 Degrees F Operating Temp Range (F) 32 Degrees to 149 Degrees F Operating Temp Range (C) 0 Degrees to 65 Degrees C Display Dual LCD Auto Power Off Auto Power Off with Disable Memory 20M data records using 2G SD card Temperature Compensation Range 0 Degrees to 100 Degrees C