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. 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 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: stainless steel Dimensions: 5.4" x 1.0" dia. (138mm x 26mm) Approvals: CE Weight: 10oz.