Ultraviolet microphone sanitizer.
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Previously:
https://www.homemadetools.net/forum/...462#post192953
https://www.homemadetools.net/forum/...727#post182899
https://www.homemadetools.net/forum/...122#post180266
https://www.homemadetools.net/forum/...589#post162766
https://www.homemadetools.net/forum/...537#post193158