Banggood

Does what it say, hope it is good quality co2 sensor because price is high. Data log not impressing, cannot connect to pc, just on screen and confused to understand. Cons - biggest disadvantage is it does not have internal battery, if you disconnect from wall socket (to take to another room) it goes off and all data erases

Bought this because I am interested in measuring air quality at home and at the office, was really surprized how hard it is to keep the green light, it requiered multiple windows open for only 2 persons in the apartment. This meter works just the way I expected, only downside is the manual... My chinese is not so good, (manual is in chinese) Shipping was about a week, as usual, even though Covid-19 outbreak is causing, lots of issues for us here in Europe now.

Expensive for what it provides. Doesn't provide logging, and only monitors CO2. Which it does as advertised.