The IAQ MAX CO2 Monitor and Data Logger is designed to measure and detect Carbon Dioxide, Temperature, Relative Humidity, and Barometric Pressure. It features a large modern Liquid Crystal Display (LCD) which showcases a 3-color code indicator (green/yellow/red) and real-time data logging capabilities for further analysis. The IAQ MAX is ideal for monitoring indoor air quality in homes, offices, classrooms, or anywhere occupant comfort can be created to ensure healthier and pleasant work and living space. With the IAQ-MAX you can take advantage of answering the "fresh air" problem of modern, sealed buildings all while ensuring energy savings by up to 30%! **Please reference the included IAQ-MAX manual for the step-by-step calibration process, customer configurable setting options (date/time/temperature/calibration), and temperature off-set to correct inaccurate temperature readings.** Please note, should you have any specific questions regarding device display, charging, calibration, or settings please reference the IAQ-MAX manual. **This device does not include PM2.5, PM10, or VOCs. Only CO2, Temp, %RH, and Baro.**