There is an option to read 4/20mA, 0-10v or contact switch inputs. Internal RH Sensor: Range 0-100%RH, Accuracy 2%RH Internal Temperature: Range -20°C to 60°C, Accuracy 0.5°C External Temperature: Range -200°C to 200°C, Accuracy 0.1°C to 0.3°C Battery Life: e.g. 2 years @ 1 min sample rate The loggers store up to 10,000 samples per sensor permitting the operation as a data logger if RF communication is not possible, e.g. one logger placed in a warehouse exhaust HVAC duct. The logger will resume transmitting data once it is in RF communication with the base station or other logger.