Qingping Air Quality Monitor, 2 Indoor Air Quality Monitor, Measure the concentration of air pollutants such as PM2.5, CO2, PM10, Noise, Temperature and Humidity, Alarm Clock Function, Smart Air

Very easy to use and the readings seem consistent between measurements. I also love that it stores the data for a period of time so you can look back at the readings from the previous night

Only the battery is an issue when not pluged in and also it does not work with xiaomi smart home

bello esteticamente e molto utile per tracciare i principali inquinanti e avere informazioni sulla qualità dell'aria. Prezzo un po' troppo elevato

These are brilliant, great quality and the app is so easy to use as is the device.

Update: 2 years later the noise sensor has malfunctioned and always shows around 60 dB. All other measurements are still working as expected, with temperature accurate, CO2 very consistent, and PM 2.5 tracking local air quality if I've got the windows open. I'm happy with the accuracy and build of this monitor. When I check outside air, the PM 2.5 agrees with local Purple sensors, which are pretty good. It uses the same type of laser particle counting cartridge. CO2 is correctly in the 400s. Temperature is spot-on checked against my Chef-Tap. It's hard to know what the VOC means, but it does rise in the basement where it smells a little musty. The sound monitoring is the only thing that doesn't work well. It never drops below 43 dB, probably because the sensor is too close to its internal fan. That's a small quarrel, given that my ears can tell me the noise level perfectly well. The form factor and screen are beautiful, and I'm hopeful it will last a while since the particle sensor is replaceable. The display is crisp and clear, and you can set a priority measurement to be large enough to read at a glance or put it into a clock mode with small air quality displays at the bottom. I was pleasantly surprised that it doesn't need the app at all. It can connect to wifi on its own, with a touch-screen keyboard to put in the password. Connected to wifi it shows hourly and daily graphs and you can set your city for local weather. The automatic time zone setting doesn't work, but it's easy to set manually. It does function off of wifi, but only shows time and immediate sensor readings. The app shows the readings and graphs but I doubt I'll use it much unless I get one of their satellite pm 2.5 sensors. It's designed to integrate into Xiaomi's Mi Home and could probably control connected air filters but that's not of much use in the US. Overall, it's a pricy sensor but well worth the money.