Air Quality Monitor, 8 in 1 Indoor Air Quality Meters, Formaldehyde Detector, Pollution Meter Sensor Detecting HCHO, PM2.5, TVOC, CO, CO2, AQI, Temperature and Humidity Tester

That's a dramatic statement but no truer words have ever been expressed. I will get to the specific point after a brief explanation. I am a retired senior and did not feel in great health lately, spending 99% of my time inside, at home. I've been having problems with my home for five years now. I've lived here for over 35 years and this has been a solid structure until recently. There has been a constant series of catastrophes for 5 years now. After renovations in a different section of the building, my house has shifted enough to cause a crack in the basement wall. In addition a section of my roof seems to have shifted and my power has occasionally cut off to my entire house. Lately I have been getting a smell of something like furnace oil fumes in my basement. My eyes were getting irritated shortly after getting up in the morning. A milky film formed over them that had to be constantly cleared to see properly. I also developed a feeling of nausea several times a day, losing my appetite. With everything combined, I was half expecting my home to tumble onto the street in a winter storm! Finally!!! I did some research to find an air quality monitor that wouldn't affect the grocery budget. It took a couple weeks to get use to the usual levels on the monitor and a few internet searches to see what each meant. I soon noticed that there was a reading of 10 to 15 times, over a 1000% increase in HCHO, formaldehyde level within a half hour. Still it remained within acceptable levels according to research. I eventually started a morning routine of opening the windows for a while. I also started to watch the HCHO levels suddenly increase several times randomly every day. Each time I opened the windows until it decreased again. Now I have almost no eye irritation or blurring and the nausea has completely disappeared. My daily feeling of well being and quality of life has improved significantly since I started monitoring air quality. I still haven't solved the mystery of suddenly increasing formaldehyde levels. I now have an idea what it is, and it's really Creepy. I'll keep monitoring by moving it to different rooms but I intend to buy at least 2 more of these so I have one for each of the 3 levels. Maybe each room eventually to help solve this terrible air quality mystery. I lastly found a huge leak in my roof maybe 4-6 ft long. I have a pull down set of stairs to access my attic so I can get up there easily. I finally had to get someone to repair my roof and was told a section of shingles had pulled apart from the roof next door. For now it's patched with cement until the spring or summer, when it will get a better look. Following that will be another serious conversation with the city about the renovation approvals process. Thank you very much for my continuing breaths of fresh air and a healthy appetite! Another save last night. I wasn't paying attention to open my windows as levels went up. Suddenly both HCHO and PM2.5 went up enough to set off the warning alarm. Thank goodness I got my windows open for a while before going to bed with such quickly increasing danger.

I bought it to prove our place was being flooded with something. This is what it did when I already knew something waa coming in. It absolutely works. It does also react to things like hair care products though so be mindful not to freak out. You can be making it go up yourself. The particulate count is stuck at 7 but it's a calibration issue. On poor air quality days, I bring it in the car and it lines up with online apps that track particulates from wildfire smoke. It doesn't tell you what it's detecting but it at least let's you know yourr not crazy. It can also be used to track down smells. I put it on top of containers and based on the readings I opened it and there was mold. It also works for sewer smells and mold or mildew from furnsces/ducts.

Seems to work pretty good! Seems accurate.. Like the portability of it!

How useful is a portable air quality detector that doesn't work unless it's connected to external power? My unit turns on as soon as I connect power via USBC, no matter which position the On/Off switch is. I can't turn it off. The On/Off switch does nothing. The battery indicator says it's charging or fully charged. When I disconnect the USBC cable, the unit shuts down, ignoring what the On/Off switch is set to.

It does monitor air quality. Accuracy is unknown but during wildfire season the particle counter does increase proportional to the smell of smoke in the air. Also my wife's hairspray causes the TVOC and formaldehyde indicators to greatly increase the readings. Temperature and humidity readings correspond with my weather station sensor.