<https://forum.308ar.com/topic/24476-sonic-cleaner/#comment-360519>
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"I already use one; but not for anything \"dirty\". I might \"need\" to obtain something new though... \n \n\n\n\tActually; now that you made me think of that. I could actually make one. I have a bunch of those ultrasonic transducers. I could take apart the one I have to check; but I'm pretty sure they are simply glued to the stainless steel \"case\" that holds the water. Damnit!\n \n\n\n\tPretty sure there is a pair of transducers; spaced out precisely to match the same wavelength so they work in tandem. \n \n"
<https://forum.308ar.com/topic/24476-sonic-cleaner/?tab=comments#comment-360562>