Review on Digital Portable Temperature Humidity Analyzer by Tim Paolucci

I bought this CO2 meter to measure both the condition of the building and "other things" relevant in 2020. The meter appears to be accurate (fresh air is 425ppm, which is very close to the current global average of 400ppm). Some might find the gauge's UI a bit annoying, but anyone who's used a DMM will get used to it straight away - same idea with modal buttons. like most modern digital multimeters. It is important to know that the CO2 measurement seems to take about 3 minutes to set the value. For example, put it under an N95 mask, give it a maximum of 10,000ppm, and then put it in a fresh breeze. It takes a minute or two to restore normal fresh air levels. This is not a show stop, you just need to be aware of it. If you make changes to the environment, wait 3 minutes before making other changes or recording measurements. Based on their behavior I am guessing that they have a very long averaging window for CO2. Relative humidity and temperature readings are set much faster - in about 10 seconds. Not like my 1 second meat thermometer but certainly good enough for any build sickness application.