A pH and temperature data recorder. It's small size and internal memory, make the pHTemp101 a great replacement for bulky and expensive preamp based systems. Accepts industry standard pH and ORB probes with female BNC connectors. Temperature compensation provided through external RTD temperature channel. Measures full range from 0 to 14pH. (pH probe and RTD Temperature probes are not included and must be purchased seperately). pH Input Connection: Female BNC jack pH Range: 0~14pH (±1000mV) pH Resolution: 0.01pH Temperature Sensor: 2, 3 or 4 wire 100 ohms platinum RTD pH Accuracy: ±0.1pH Probe Temperature Range: -40~+125°C Temperature Resolution: 0.01°C Calibrated Accuracy: ±0.1°C Memory: 13,107/channel Sample Rate: 2 seconds up to 12 hours Required Interface Package: IFC110 Baud Rate: 2,400 Typical Battery Life: 1 year Operating Environment: -5~+50°C, 0~95%RH non-condensing Material: ABS plastic Dimensions: 2.4" x 4.5" x 1.0" (61mm x 115mm x 26mm) CE Approval: Yes Weight: 7.5oz.