Banggood

Recently I have received purchases from Banggood that have been poorly packaged for shipping. This however was adequately protected for the trip to the USA. Instructions in English are a little lacking as expected & required a bit of trial & error in setting it up the first time, no big deal. It works as indicated & must be fairly accurate since it displays particulate readings very close to local Air Quality Monitor readings. It gives fairly consistent readings for HCHO & TVOC

Not an expert on these but it works. Burn the toast and this dust particle index goes way up. This tells me however some concerns I had are at a very low to negligible level so peace of mind for that. To run full time it needs to be plugged in as the internal battery is only good for a few hours. Good unit Recommended - YES

After charging the batteries and the green light is on (fully charged) , the battery indicator shows not fully loaded and within minutes the indicator shows low battery

The built Li-ion battery is not adequate so you are obliged to keep it connected to a main plug