Portable Indoor Air Quality CO2 Extech CO250

Checks for Carbon Dioxide (CO #39; #34; #34;) 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) CO #39; #34; #34; sensor Measurement ranges: CO #39; #34; #34;: 0 to 5000ppm Temperature: -14 to 140F (-10 to 60C) Humidity: 0.0 to 99.9%