Used it for cleaning glasses. There must not be any defect scratch in the lens/body coating or else you will regret it! I tried cleaning older glasses that I haven't used. It destroyed (chipped) the lens where the coating had already wore off. I suggest doing deep cleaning on a non-frequent basis or get a lower frequency cleaner. Most are around 30-40kHz. This one is 50 kHz and will get into smaller crevices and cause damage if there is a scratch.
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