Re: e-perm testing reliability


The e-perm is a widely used very accurate radon testing device. Many variables
may influence indoor radon levels from day to day, month to month and year to
year. I suggest you contact your State Radon Office to discuss your wide difference
in test results. The first question is always were you in control of the home
when the first tests were done? Hope this may help get you started.

William Levy