pH/ORP/Temperature Datalogger pH Range 0 to 14pH ORP Range -1999mV to 1999mV Temp Range (F) 32 to 149 Temp Range (C) 0 to 65 Display Dual LCD Auto Power Off Auto Power Off with disable Memory 20M data records using 2G SD card Temperature Compensation Range 0 to 100 degC Calibration 3 point Interface SD Card and RS-232 interface Cable Length 39 inches (1m) Power Source six AA batteries