Bests & Worsts Reviews from Amazon

This is not the product if you want an honest reading. I purchased 1. Used it for 2 weeks, my living room had a very high reading. Reset the unit ran another week. Very high. Purchased 3 more. Figured I should be checking every where to decide which room has the most concern. Put all 4 in she same spot. All within 24 inches to see if the would read the same. After a week, all 4 have different readings. A difference of 5.0 from lowest to highest. Reset them, tried again. Same thing.