This portable indoor air quality CO2 meter monitors carbon dioxide (C02), temperature, humidity, dew point, and wet bulb. Checks for CO₂ concentrations and computes statistical weighted averages of TWA (8 hour time weighted average) and STEL (15 minute short-term exposure limit). User-programmable audio alarm. Data acquisition software and cable are included for recording and documenting CO2, humidity, and temperature measurements. Comes includes software and cable, 4 AA batteries, and a carrying case.