The 5-in-1 professional air quality meter is equipped with an advanced sensor and detection algorithm to accurately measure HCHO, CO2, TVOC, temperature and humidity data. The air quality meter features a large color LCD display, easy to read even in dark environments. The colored bar changes in real time as the recorded concentration changes and alerts users via a color change. Air quality meter with built-in 1200 mAh high-performance battery for longer battery life, rechargeable via USB, you can charge the air quality meter via power bank, power adapter, computer, PC, laptop. With a healthier lifestyle at home, the air quality meter automatically and accurately detects the concentration of CO2, formaldehyde, and VOCs in the air, and is often used in homes, cars, hotels, apartments, offices, bars, libraries, outdoors, and more. We are committed to providing a high-quality air quality meter to ensure a healthier lifestyle without risk.