EXTECH CO250 Digital Portable CO2 Meter

Features: • Checks for Carbon Dioxide ( CO2) concentrations • Calculates statistical weighted averages of TWA ( 8 hour time weighted average) and STEL ( 15 minute short term exposure limit) • Maintenance free NDIR ( non-dispersive infrared) CO2 sensor • Measurement ranges: o CO2: 0 to 5, 000ppm o Temperature: -14 to 140° F ( -10 to 60° C) o Humidity: 0.0 to 99.9% • User programmable audible alarm • Backlit triple LCD display • Built-in RS-232 interface for capturing readings on PC • Data acquisition software and cable included to record and document CO2, Humidity and Temperature data • Optional 33% and 75% RH calibration bottles • Complete with software and cable, 4 AA batteries, and carrying case