The tempmate.®-B button cell and button sized data loggers are unique not only because of their size, but also their wide operating range from -40°C to +140°C.  They are robust, rugged, re-usable, ultra compact, and light-weight.  The long lasting 3.0V lithium battery is up to 10 years with a sampling rate of 1 to 255 minutes (your configuration).  An optional 3-Point Calibration Certificate available.  A Free TempIT-Lite software download is used for configuration and data analysis. 
 
tempmate.®-B1          Measuring range: -40°C to +85°C Accuracy: ±1°C
tempmate.®-B2          Measuring range: -40°C to +85°C Accuracy: ±0.5°C
tempmate.®-B3          Measuring range: 0°C to +125°C Accuracy: ±0.5°C
tempmate.®-B4          Measuring range: -20°C to +85°C Accuracy: ±0.5°C; 
                                      RH measuring range: 0% to 100% RH accuracy: ±5%RH
tempmate.®-B5           Measuring range: +15°C to +140°C Accuracy: ±0.5°C
USB Interface              USB interface for reading the collated data from all tempmate.®-B data loggers.
 
Other Accessories and Pro Software Available...Please Inquire.