Review on 🌡️ Advanced Moisture Pollution Detector: Track Temperature and Humidity with Precision by Tom Beland

I was specifically interested in these air quality meters to understand how good the ventilation is in different rooms. The first thing I noticed was that while the charging port was USB-C, it wasn't actually charging from a USB-C source. Instead, I had to use a USB-A to USB-C cable (one included). This isn't the first low-cost product I've come across this in, but it's annoying. The second thing I noticed was that the temperature readings were in Celsius with no ability to switch to Fahrenheit for Americans who don't understand the metric system. It also shows the relative humidity. Then I checked the CO2 measurement, which is the main function. The absolute number isn't that important - you need to know 1) if the reading is higher than expected (over 1000ppm indoors) and 2) what the trend is over time. I installed it in my home office and the readings stabilized around 450-500ppm which is typical for rooms with good air circulation. I then took it down to my basement with poor airflow and the reading went up to about 1100 - reasonable. Then I took it outside on a clear day and the reading stayed at 500. I was expecting lower. Eventually I brought it back to my home office and the readings stayed high at first. But after about an hour he went back to the previous reading of 450-500. A four-color segmented ring surrounds the CO2 reading with a flashing segment representing the total (see product description). The blinking distracts me. This is an acceptable CO2 monitor if you understand that absolute measurements are less important than trends or totals. It would be nice if the temperature display could be switched to Fahrenheit.