Hey Guys, thou this article is quite old, I just found it
and thought It might be useful for me and my fellow AHers
http://www.realtraps.com/art_microphones.htm
Bottom line: All tested measuring mics (including DIY), but RadioShack stuff - are good.
Newer RS Digitial SPL Meter is precise from 33hz to 1Khz
Older RS Analog SPL Meter "ok" from 33Hz to (somehow/stretching it) 7-8Khz
