Temtop Air Quality Monitor Indoor Thermo-Hygrometer - PM2.5, AQI, Temperature, and Humidity Meter for Home, Office, or School, Air Quality Measurement, 60-Day Battery Life

Purchased to monitor PM 2.5 indoor concentration primarily due to the Canadian forest fire plume. Placed outside to compare with local NOAA measurements and found reasonable agreement and good sensitivity to changing conditions. Temperature and humidity readings match other monitors. Good battery life, allowing flexibility in monitoring locations. Definitely a good purchase.

It’s working fine now! My bad. I shouldn’t have been so hasty in posting a negative review. Apologies.

Works as it should. Very interesting to see how many pollutants are in the air. I was stories at all the natural cleaners i use that put it in the yellow or red.

Easy

Does what I need. Nice magnet

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!

Tried this in two different workshops with plenty of find sanding and saw dust. The PM2.5 meter never went into the double digits. The only time I could get the meter to go into the double digits was when it was under bright LED lighting, or literally blowing dust into the sensor (see photo where it reaches 10). The manual warns against bright lights as it can confuse the optical sensor. I would see up to a PM2.5 reading of 80 with LED lights on and 1 with them off. Anyway, this meter is completely unreliable and is being returned.

It's easy to use and gives good information. I only wish it had a back light to make it easier to see