CO2 measuring devices and traffic lights in the test - Good devices for less than 100 euros

How can corona be stopped indoors? Experts recommend: Keep your distance, wear masks and ventilate a lot. CO2 traffic lights can help to slow down the virus. No, CO2 sensors cannot detect viruses - but they do indicate when it is time to ventilate. Stiftung Warentest tested a total of 26 of these CO2 measuring devices and CO2 traffic lights. After we had already put 11 devices under the microscope at the beginning of the year, we were able to examine 15 more CO2 measuring devices and traffic lights at the end of the year.