See report number 3 below – dB Meter & Spectrum Analyzer Review

(See update) (original review--5 stars). The calibration feature is uncommon among sound level apps–good feature. Clean design. The addition of a higher contrast screen toggle would be awesome. Another app that makes our phones that much more useful. (Update--3 stars). I want to like this app. Developer states for personal use. Suspect most higher ratings from those who haven't confirmed operation of app. I have since checked against Quest metering and calibration equipment. There's no easy way to calibrate this app without crashing. Tried everything: reset phone, shutdown/restarted phone, try calibrating again and again (5s).... Won't get into specific readings and numbers. Bottom line: not accurate as I hoped it would be but find it roughly acceptable for gross measurements only--quiet, noisy, loud enough to probably need hearing protection--dbA only. DbB, dbC not even close. To be fair let's consider that the app resides on a "phone". Be careful. 3 stars down from 5. (Report 3, Jan. 24, 4 stars) Update released January 24… Good news, at least for me, no more crashing during calibration of DbA. But, DbA calibration tricky at higher noise levels. Measures accurately at mid levels. (See #value delta of cal. screen vs. live measure screen). Developer: thank you for conscientious updates. On your way to "best-of" app Users: quick note – remember to hold your phone upside down, microphone in the air, not in the palm of your hand blocking microphone. Developer--possible tweak for future updates??-flip screen 180 degrees feature!!
Review by No app ad-man on dB Meter & Spectrum Analyzer.