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Extech CO250 Information The Extech CO250 is a portable indoor air quality CO2 meter that measures carbon dioxide (CO2), temperature, humidity, dew point, and wet bulb. It also calculates statistical weighted averages of TWA (8 hour time weighted average) and STEL (15 minute short term exposure limit). The CO250 has a user-programmable audible alarm that can be set to go off when CO2 levels reach a certain threshold. It also includes data acquisition software and a cable that can be used to record and document CO2, humidity, and temperature data. Introduction The Extech CO250 is a valuable tool for anyone who wants to monitor the indoor air quality in their home, office, or other enclosed space. It can be used to help ensure that CO2 levels are not too high, which can lead to health problems such as headaches, fatigue, and difficulty concentrating. The CO250 is also a useful tool for businesses that need to comply with government regulations on indoor air quality.