The UEi AQM4 is a digital air quality meter capable of taking four measurements in one instrument; carbon monoxide (CO), carbon dioxide (CO₂), temperature, and relative humidity.

Use calculated 8-hour Time Weighted Average (TWA) and 15-minute short term exposure limits (STEL) of CO₂ for compliance testing and CO measurements for safety-testing.

Record, recall or download all readings to a personal computer for later analysis or record keeping.

The AQM4 is backed by a 2-Year limited warranty.