CEM Air Quality Monitor PM2.5/10, HCHO(0-5.00mg/m³), CO2(0-9999ppm), humidity, temperature,-4~158℉and AQI.Tested by AQMD, R2 up to 0.999, Indoor Outdoor,Professional noise and touch sensor DT-9681

the charging is terrible and the connection broke and cannot use it anymore. tried to contact Company and no response about the battery and why it will not charge properly

So easy to use! I just wish you could hold it on the measurement you are checking instead of it scrolling though all of them

The AC charge port became loose and they wouldnt replace the unit. The batteries are unavailable and discharge within a few hours. It was great while it lasted , about 6 months. I had to delete my Amazon account I purchased this with due to harassment from an unknown Amazon associate. O was accused of stealing gift cards, locked out of my account, threatened, yeah real nice...I should have sued them I really should have. Anyway as a result of cancelling thr original account I no longer have the reciept they demanded to warrant this.

This is a really simple device to use. You literally just push the power button and it starts working. It’s nice that it has a battery option so you can move it from room to room without having to plug it in.It appears to working as numbers change depending on what’s going on around it.My next move is to get an air purifier and put it in the same room to check if they both work. It for now, pretty cool to see the numbers.

no complaints here