Very bad value, there is a simple test to do to realize that it is defective, put hydroalcohol gel on your hands and approach the sensor, A few seconds later the sensor crazies and rises to 5000 !! You're Dead! Long minutes to return to a lower value

There are no complaints, he tagged on the street, he breathed on him, put in the workplace, during the time changes the testimony, Googled norms and typical levels levels levels levels Now the question is only to the longevity of this device.

Received today the 11/01/22 very good CO2 device works perfectly well recommend this seller to all 100% serious and honest and very fast delivery recommend thank you very much

Fast shipping. The product corresponds to the description. The accuracy of the device does not measure the possibility. The battery holds about 2-3 hours. Seller recommend.

Ordered 2, show "a little" different digits, wrongly react to pairs of alcohol-if next to a glass put straight scale, probably this is the features of the sensor