Noise gun designed to check the sensitivity of microphones.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...n_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h..._noise_gun.jpg
Previously:
https://www.homemadetools.net/forum/...944#post160269
https://www.homemadetools.net/forum/...020#post112166
