Review on Professional Hand-Held Formaldehyde Detector - TOPINCN Portable by Tim Ram

I can't comment on the accuracy but it tells me I don't have to worry about buying a more expensive one. I'm assuming the sensors are all the same, so I don't see how that wouldn't be accurate. Ease of use is very simple! turn it on After a minute or two, it will show you the levels. Starts low and only builds two buttons. nutrition and calibration. You can pause and restart the calibration. No instructions required.