Review on 🌬️ CO2Meter RAD 0301 Mini Monitor White: Accurate and Compact Air Quality Detector by Chef Buntiloy

I purchased this instrument and almost immediately I was unsure of its accuracy as it read 1200 PPM on the inside and over 800 PPM on the outside. I asked Revain for a replacement to confirm accuracy and in fact the difference between the two is usually over 600ppm. So, having two very different results, I naturally asked for a DIFFERENT substitution, expecting that it would match readings from at least one of the blocks, and I knew what was good and what was bad. But that's not the case. Remember it's closer but still 100-200ppm off the replacement and more than 400ppm off the original.