The RFpHTemp101A is a pH and temperature (RTD) data recorder with built-in, wireless (RF) transmitter. Using the RFC101A receiver, the RFTemp101A can transmit data up to 120 feet, line of sight. Built-in memory also stores data internally. 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). Note: Approved for use in the US and Canada only. pH Measurement Range: 0~14pH pH Measurement Resolution: 0.01pH pH Calibrated Accrracy: ±0.1pH RTD Measurement Range: -40~+125°C RTD Measurement Resolution: 0.01°C RTD Calibrated Accuracy: ±0.1°C @25°C Memory: 13,107 readings per channel Sample Rate: 30 seconds up to 12 hours LED Indicator: Red & Green Required Interface Package: RFC101A PC Baud Rate: 57,600 RF Carrier Frequency: 418 ±0.075MHz RF Baud Rate: 4800 Output Power: <0dBm typical (<1mW) Receiver Sensitivity (RFC101A): -90dBm typical Typical outdoors/line of sight: Up to 120' (36m) Typical indoors/urban line of sight: Up to 40' (12m) Approvals: US(FCC), CA(IC) Typical Battery Life: 1 year Material: ABS plastic Operating Environment: -5~+50°C; 0~95%RH non-condensing Dimensions: 4.5" x 2.4" x 1.0" plus 2.0" antenna (114mm x 61mm x 26mm + 51mm antenna) Weight: 4oz.