Air Quality Detector--With the combination of electrochemistry, semiconductor and temperature and humidity sensors, this multi-function air quality detector can not only accurately detect CO2, HCHO, TVOC in real time, but also comprehensively detect the temperature and humidity Real-Time Monitoring--The sensor incorporates NDIR (non-dispersive infrared) waveguide technology and has a built-in carbon dioxide (CO2) Automatic baseline calibration for long-term drift compensation. With a digital + analog bar color dual display, the measurement result is more intuitive and precise readings for CO2, HCHO, TVOC, temperature, and humidity Compact & Portable-- With its small size and battery-powered operation, this carbon dioxide monitor is easy to o move from room to room or even take with you when traveling Easy Setup & Use--No complicated app, No Wi-Fi required. Our indoor air quality meters was specially designed to be operated by anyone, anywhere, so you can keep your space safe without a tech-induced headache Versatile and Essential-- Our air quality monitor is a must-have for any home, office, and other building. It detects gas and air pollution in a variety of settings, including kitchens, bedrooms, schools, and more