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We always used aluminum foil to verify that the ultrasonic cleaner was ultrasonicifating. Hung a 1" wide strip into the bath and timed how long it took to perforate - usually only a few minutes for the lab-type units we got from VWR.
It seems like a test like that would be a way to check if whatever transducers you had were "good enough".
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'78SC, lots of other boring cars...
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