It doesn’t even react to fast-rising CO2 levels. I put one into a closed tank and emptied a 9g bike tire refill into the volume – the reading DECREASED

Using CO alarm test kits has eimilar effect on reported CO levels (essentially – “zero”) whilst the same units will go nuts if exposed to the faintest whiff of alcohol and peg the CO2/CO readings in a perfectly safe atmosphere

These uniits are DANGEROUS – not because they give fakse positives but because they give false negatives.

The FTC needs to get involved (and European safety regulators too)