Accurately measures temperature and humidity (when the sensor is exposed) up to 100%RH. When closed, it is submersible and can monitor temperatures to depths of 150' (45mm) of water. Perfect for environmental studies. Software provides readings in standard or metric units and automatically calculates Dew Point and Vapor Concentration calculations. Stainless steel enclosure. 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 Resolution: 0.5% RH Humidity Accuracy: ±3% RH Memory: 21,845/channel Sample Rate: 2 seconds up to 12 hours RH Units: %RH, dew pt., water vapor, concentration (mg/hl) Required Interface Package: IFC110 Baud Rate: 2,400 Typical Battery Life: 1 year Operating Environment: -40~+80°C, 0~100%RH Material: stainless steel Dimensions: 5.4" x 1.0" dia. (138mm x 26mm) Approvals: CE Humidity Range: 0~100%RH Weight: 10oz.