[Jens]’ device consists of an Arduino, LCD display, and two sensors – one for acetone, ... Posted in Arduino Hacks, Medical Hacks Tagged gas sensor, keto, ketosis, TGS822.

If you believe that a PM2.5/10 sensor can also detect O1, NO2, SO2 then go right ahead and market it as an “Air Quality” sensor. I look forward to the law suits.