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CP I do not know anything about your test equipment. A neighbor decided to run a test. This person put 4 units in an open basement - no walls - area about 25 by 35 feet with 12 feet from concrete floor to joists. The results had a variation between samples that averaged 25%.

At a minimum if your equipment is the same, have to assume a reading of X could be anywhere from 0.75X to 1.25X.

Now for the bad news, generally speaking precision - the ability to get the same answer is easier than accuracy.

Finally think about how much time you spend in the area tested. My neighbor realized after the testing, they spent less than 1 hour per week in the basement.

Good Luck

Gordon
Atlanta
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