Extech CO250 Air Quality Meter:

This Portable Indoor Air Quality CO2 Meter measures Carbon Dioxide (C02), Temperature, Humidity, Dew Point, and Wet Bulb. Checks for Carbon Dioxide (CO₂) concentrations and calculates statistically weighted averages of TWA (8-hour time-weighted average) and STEL (15-minute short-term exposure limit). User-programmable audible alarm. Data acquisition software and cable included to record and document CO2, Humidity and Temperature data. Complete with software and cable, 4 AA batteries, and a carrying case.

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