Safety Siren Pro Series 3 Digital Radon Gas Detector

How far off were yours from each other when tested side-by-side?

If you can believe it, I never tested both my radon detectors side-by-side before. The other day I took the one from upstairs and put it downstairs on the other side of the basement from the other. One reads 3.0 and the other reads 4.5 so not I moved them side-by-side to see what I get as a reading.

I just moved them together today. I should reset them and wait 2 days.

I didn't reset mine, I will just have to leave them there long enough to allow for a complete change.

I did not reset the two unit and the reading were dropping over the last week but they were off 6.6 and 18.7

I just checked mine and they say 3.2 & 4.5 so I will keep watching them over the next few days to see any change.

I just checked my two radon detectors again and now the one is still 4.5 pCi/L (as expected) and the other one that I moved from upstairs to the basement (still sitting right next to the other one in the basement) now reads 4.4 pCi/L so I am impressed! I will give it a few more days to see if it will reach the 4.5 level. I have no way to prove 100% that the true level of radon in my basement is 4.5 pCi/L but I can safely say these two radon detectors are calibrated the same.

The test results are in from checking to see how close my two radon detectors are calibrated.

lucky, mine are .3 difference.