Grehge r Indoor, Portable CO2, Formaldehyde,Temperature, Humidity Detector with Audible and Visual Alarm for Home, Office and School, Real Time Test, Battery Powered Price: £89.99 (as of 02/06/2024 21:49 PST- Details)

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