Temtop Air Quality Monitor, Indoor Thermometer Portable AQI PM2.5, Temperature, Humidity Detector for Home, Office or School, Air Quality Tester, Battery Powered, Magnetic Suction

I've been using these for quite a bit. Now they seem to be fairly accurate, they're probably only you point .5- .8° different than other thermometers. I'm not sure how accurate the PM 2.5 or the aqi are. It holds a charge for a long time as well.

I suffer from acute sinusitis and allergies. This season in Texas has been especially bad, and I felt that I was not feeling any better when indoors, even after taking allergy tablets. I wanted to make sure that my home was not actually making the symptoms any worse so decided to check by purchasing an air monitor. This one had good reviews and was reasonably priced. It arrived quickly and took minutes to set up right out of the box. I also like the stand that came with it and the fact it has a magnetic back, so it can be placed on a fridge or filing cabinet if needed. I wanted something easy and simple to read, and this has just what I needed, temp, humidity, air quality index and particle measurements. Within a few days I had readings for all major rooms, and fortunately all were good. It was comforting to know that the air inside my house was good and not making the symptoms worse. A great little unit.

The devide seems to be working and provides a good reference point to the indorre air quality. The biggest negative is that the screen is impossible to read (for those of us with older eyes) due to hardly any contrast between the black numbers and the dark gray background.

I was told by my pulmonologist to buy some hepa air purifiers for my allergies and asthma. While researching those I came across a review where the commenter mentioned she bought an AQI to test if the air purifier works well. Now I never heard of something like this existing - I thought you would have to hire a specialist to come out and test for things like this with expensive professional equipment. If I had known about an AQI before I would have bought one ages ago.I've seen a lot of criticism about the battery life, but there are actually 4 settings. When I first got the device I put it on the R setting (test every 2 seconds) and walked around each room of my apartment to see what the air quality actually is. This setting uses the most battery power and I don't like it because the numbers swing wildly and it's confusing. I tested out other settings as well and decided to keep it at A. While on A the AQI remains fairly stable. I recieved my device almost a week ago and the battery is at the halfway point.How do I know this device is accurate? The AQI remains mostly in the single digits, but when I light a cigarette the device can go as high as 80. I was shocked, I had no idea it was that bad. This gives me something to think about......One last thing - my car A.C. is running cool not cold like it should. I already took it back to the mechanic twice after paying 2k for a total rehaul. The mechanic insisted, on my 3rd visit, they tested the temp of air coming out of vents at 48 degrees. I knew this wasn't right at all because I'm sweating like crazy. One day I had to run errands in diff parts of town. I bright this monitor and put it on the console tray which is right above knee level. The kickstand included was so helpful! I drove to 4 places in 3 hours, about 60 miles altogether. After each stop i took a photo of the reading (please note AQI is higher in 2nd photo because I smoked with the window cracked). The interior temp of my car never went below 90 (live in Arizona) and I plan to take my evidence back to The mechanic to prove they didn't do it right the first 3 times. Thank your for creating such a useful device at a great price!

Battery is pretty good. Over all nice little unit.

Not accurate at all. I bought two, placed on in a bedroom, and the other in the living room. One was reading 06 ųg/m3 and the other 20 ųg/m3z. I left them in each room for about an hour. I then swapped them to test if the measurements would adjust to swapped rooms, but they remained the same after an hourI also have a 3 high-quality hepa filters with air quality measurements, and I trust them - those readings fluctuate and these numbers on this product do not.For example, if I sweep, pour cocoa powder into a bowl, or spray an air freshener, my hepa filter will immediately detect those particles and the displayed measurement will increase (thus upping the hepa filter fan speed) but these devices do not detect changes in the air at all.I’m not sure that these are good for besides temperature. A subpar and completely unreliable product if you’re looking for air quality measurements.