2.8" Digital Car PM2.5 Air Quality Detector Tester Meter AQI Home Gas Monitor

I've been comparing data readings to the Dylos and other top end home meters and this unit is spot-on, at least on the low end of the scale (2-10 ug/m3).Nice that is is USB powered for car and portable use. I took off one star because there is no wifi, bluetooth or data-logging function, which can be very useful. Still for the price it is a good deal and give good data.

Used quite a bit to help my wife who has some lung thickening from allergy to pollution (still going through tests) to get a clear understanding of particle pollution at her work and at home. We noticed that our bedroom ultrasonic humidifier was causing a reading of very high pollution, water droplets get counted as particles. This made the HEPA filter seem less effective than it really was but knowing this we stopped using the vaporiser and used a PC case fan across a bowl of water with a towel as a wick instead, humidity was the same and readings far more accurate.I would have expected the bedroom vaporiser's droplets to become gas effectively in seconds.. but somehow they float around a long time in the bedroom. For scientific use some air dryer should be employed I expect but for day to day use, not so pretty but it works every time.

Really simple and bare bones, just plug it into the USB and it gives you a reading of the air in the room you're currently in. I compared it with the AirNow.gov air quality readings locally, and it seems accurate. Really great way to keep track of how your house air quality is doing (during wildfire season especially) and whether you need to run that purifier or not.

I don't know the accuracy of the sensor, but I do know it tracks the air changes well. If I don't do woodworking my garage for a few days or a week I can go in there and it always reads between 5-12. Once I start cutting things it gets up to 50 quickly and above. Once I kick on my air purifier it goes back down to 0-1 quickly.So, the way I use it is that I try to keep my dust mask on anytime this sensor is above 15.It does the job for me without spending hundreds on more expensive/polished units that basically tell me the same thing.. and that is when to keep that dust mask on and when it's safe to take it off.

This is a nice and accurate little air quality meter, based on a high quality sensor. Was considering building my own using the same sensor, but this one really does everything I need. Tested it next to an EPA sensor in my area and the reading was spot on.

Works as advertised- quick to respond to changes- boots up quickly- screen is easy to readPerfect for SoCal smokey skies

When I first got this it worked fine and matched up with the numbers I was getting from my air purifier and our local air quality reading. Now however, it reads 0-1 all the time for the PM indexes and the particle counts it's giving are impossible outside of a clean room environment, it reads only 2 on particles greater than 1.0um.Today our local PM2.5 air quality is bouncing around from 22-50, yet this stays at 0-1.It has become horribly inaccurate and will be returned.

I have learned that the best gifts for my husband always measure something. Accurate information is the best gift in the world and he just loves sensors of all kinds. This gift was a hit out of the park. Especially at it's price point. Lots of good experiments and different locations and charts, etc. He is in his glory! :-)