Model 7515 is a cost-effective meter for carbon dioxide (CO2) measurements. Models 7525 and 7545 simultaneously measure and data log multiple parameters. Model 7525 measures CO2, temperature, humidity, and calculates dew point, wet bulb temperature and % outside air. Model 7545 adds carbon monoxide (CO).

The TSI™ IAQ-Calc™ Advanced IAQ Meter calculates % outside air from either CO₂ or temperature readings and directly calculates dew point, wet bulb temperature, absolute humidity, and humidity ratio. The dual-line display simultaneously displays multiple parameters. Datalogger logs up to 26,900 samples with time/date stamp. The included Logdat™ software permits easy transfer of data to your computer and the Logdat Companion for Excel® automatically graphs all your data.

What's included: NIST-traceable certificate, carrying case, manual, and four AA batteries. Model 86384-16 also includes an AC adapter.