Worthless meter- always way too high

I just had this and two other app decibel meters measuring noise at a construction site by my house. We had them side by side with two different state (FL) certified meters. These two were within 2 dB of each other. This app on the other hand, was off (always way above) 22-50 dB at all sites we tested. With such an error this meter is completely useless. It is not useful at all. The meter is never below 55 and hits 80-90 range all the time. When it was 84 dB this meter was between 97-110. It is completely useless. You can not use it for anything at all. Do not even try - it is so off. Very disappointing.

Rogsav about Decibel Meter - Measure the sound around you with ease