I am impressed with this air quality meter. I'm a home inspector and wanted to add air quality check for my clients. This device provides PM2.5, PM10, number of particles (per/L), formaldehyde levels, temperature, humidity, and air quality index. That's a lot for the small price. The color screen is great as well and shows in photos that I take for the clients. My only complaint is that the unit did come with a sticker on the screen that was difficult to remove and clean off the residue. If you need a handy meter for air quality on the job or at home this one has a lot to offer.