I've had this monitor for a few days now and have tried it inside, outside, on top and so on. I am satisfied that for you at home and outside it offers a level of accuracy by default, which means that we can check changes in the output. I sucked and the AQI went up, then I put on an air purifier which was the status quo and saw a drop after a few minutes - same effect happened in the man cave as some outside air came in. I recommend following the instructions to let it air out of the box for 6 hours and lightly pressing the power button to get the reset. We are going to have a home ionizer installed next week and I hope to provide more data to authenticate this device. I read other reviews and chose this one and am very happy with it. My only outcry would be that I originally tried to put the charging connector in holes that were actually sensors. So it might help to mark the spot where the charging connector goes with some stupid color - that might just be me :)
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