This humidity and temperature recorder provides high performance, resolution and accuracy measurements. It's small size and internal sensors allow for easy deployment in hard to reach places. The 10 year battery allows for extended monitoring. Temperature Sensor: Internal semiconductor Temperature Range: -40 to +80°C Temperature Resolution: 0.1°C Temperature Accuracy: ±0.5°C Humidity Sensor: Internal semiconductor Humidity Range: 0~95%RH Humidity Resolution: 0.5% RH Humidity Accuracy: ±3.0% RH Memory: 21,845/channel Sample Rate: 2 seconds up to 12 hours RH Units: %RH, dew pt., water vapor, concentration (mg/hl) Alarm: No LED Indicator: Red Required Interface Package: IFC110 Baud Rate: 57,600 Typical Battery Life: 10 years Operating Environment: -40~+80°C, 0~95%RH non-condensing Material: ABS plastic Dimensions: 1.7" x 2.3" x 0.8" (44mm x 59mm x 21mm) CE Approval: Yes Weight: 2oz.