Temtop M2000 2. CO2-Luftqualitätsmonitor, Luftqualitätsdetektor für PM2,5 PM10-Partikel CO2 HCHO

It's the more complete product for air quality. Besides it performs graphics and data transfer. It's very stable.

After initial calibration the unit seems accurate enough when compared to the professional CAQI measuring equipment situated on a main roadside less than 2km away.
The monitor is easy to use but the main problem is the battery operation time after charging, maybe a higher battery capacity would improve the operating time.
At this price range, this unit it appears to be good value for the money spent.

Works quite well...

Bought to look at pm levels when using our wood burner and co² levels in our house. PM levels are OK but interesting to look at. Co² levels are an eye opener, 600ppm at bed time and 1700ppm in the morning. We have been sealing our house up to stop draughts and reduce energy. 2 people and 2 dogs need ventilation or a MVHR system installed. Thus unit and my infra red camera are the best devices I have purchased in the last couple of years. The battery lasts a long time but I'm only using it for short period, not constant monitoring. Not used the export feature yet.

Excellent instrumentation with a great price