Noise gun designed to check the sensitivity of microphones.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...n_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net..._noise_gun.jpg
Previously:
https://www.homemadetools.net/forum/...944#post160269
https://www.homemadetools.net/forum/...020#post112166
