Review on Enhanced Digital Quality Detector for Temperature and Humidity Analysis by Robert Ryokan

I bought this during the 2017 California wildfire season and I use it every fire season. This is a very comfortable and excellent device. If you own one of these cell phone batteries, you can turn it into a portable device to use in the car and briefly measure the air quality outside. I think it's pretty accurate. I compare this to my local purple air readings (instant mode) and they are in the same range. The key point with these measurements is that every location is different and outdoor air quality can vary significantly depending on the wind. Therefore it is generally more accurate. Yes, it will show close to 0 when there is very little air movement or particulate matter in the room. Change the setting with the small knob and it will specifically show the actual measurement. The display clearly shows volumetric readings, so they are rounded up to 0.