Extech CO260 Indoor Air Quality CO / CO2 Meter

Amazon

Measures CO, CO2, Dew Point, Wet Bulb, Air Temperature, and Relative Humidity on large backlit LCD Built-in maintenance free NDIR (non-dispersive infrared) CO2 sensor Programmable CO warning level with audible alarm Calculates statistical weighted averages of TWA (8 hour time weighted average) and STEL (15 minute short term exposure limit) Continuous datalogging up to 32K readings

Test-meter.co.uk

Extech CO260 multi-gas metre. measures CO (0-1000ppm), CO2 (0-9999ppm), temp (-20-60°C), humidity (0-99.9%). Infrared sensor, datalogging, PC connectivity, audible alarm. Ideal for air quality monitoring.