Review on RCYAGO Air Quality Monitor Formaldehyde by Tony Wilson

This detector is so inaccurate. I mainly use it to measure CO2 in my bedroom. After being in a room with the doors and windows closed for a few hours/nights the detector maintains a level of 400ppm which as you can see is not true because 400 is something you can only see in our doors or when you open the window In other cases, the detector will remain at 500 ppm for several hours and suddenly rise to 6000 within 2 minutes. I'm so confused by the numbers that I don't think they're credible. Will probably have to switch to a more expensive one.