Testo 176 data loggers offer easy data collection, dual mode readout, USB interface, and SD card. ideal for equipment commissioning and troubleshooting. Inexpensive to install in multiple locations so you can perform a complete analysis. Record measurement values, max/min, date, time. All data saved, regardless of battery condition. Long-term and multi-channel temperature and humidity measurement. Channels: 4 x external. Measuring range: -328 degree to 752 degree F (Type T) -310 degree to 1832 degree F (Type K) -148 degree to 1382 degree F (Type J). Battery life (at 77 degree F): 8 years at 15 minimum measurement rate. Operating temperature: -4 degree to 158 degree F (-20 degree to 70 degree C). Battery type: 1 x Lithium (TLH-5903). Measuring Cycle: 1 sec - 24 hr. Memory: 2 million readings. Measures 2-1/2" length by 1-19/64" width by 4" height.