Hama Air Quality Meter (CO2 Traffic Light, Carbon Dioxide Detector for Measuring Room Air, Monitor with Display Temperature and Humidity), Black

CO2 air meter: determines concentration of carbon dioxide (CO2) and displays value in ppm, includes temperature and humidity display Air quality monitor: display with ventilation recommendation (green/yellow/red) and note sound, measurement by NDIR sensor (non-dispersive infrared sensor) Many locations: compact CO2 meter is suitable for home, office, public institutions, clubs or rooms with many people and much more. Rechargeable battery: device can be approx. 3.5 hours without power supply, an external USB power supply is required for charging (not included) Box contents: 1 x air quality meter, 1 x micro USB cable, 1 x user manual (English language not guaranteed)