An Intrinsically Safe (IS), rugged, humidity and temperature recorder. Certified as Intrinsically Safe for Class I, Division 1, groups A, B, C, D and non-incendive for Class I, Division 2, groups A, B, C, D for safety and use in hazardous enviroments. Software provides readings in standard or metric units and automatically calculates Dew Point and Vapor Concentration calculations. Aluminum enclosure (Stainless steel, also available) 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: 0~100%RH 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: Available in aluminum or stainless steel Dimensions: 5.4" x 1.0" dia. (138mm x 26mm) Approvals: CE IS rated Weight: 5oz.