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I have cleaned 625 mesh (20 microns) with an ultra-sonic cleaner (it is one of the only ways). 625 mesh is very delicate, so I cannot see how a lab grade cleaner would damage an electronic watch / gauge.
That being said, I could see some mechanical parts being damaged or uncalibrated by the vibration.
Your best bet is to contact the manufacturer for anything with moving parts.
Well, as a "just in case" kinda thing. It would be nice to know.
Take my everyday watch, for instance. Just when you think its clean, pop it into an ultrasonic cleaner and watch even more dirt come out.
But overall, I agree. I don't think it'll reach that point, but there's always a possibility.
As an avid collector of mechanical watches, I'd tell you that an "everyday watch" shouldn't go into an ultrasonic cleaner either. Perhaps if it's a quick dip for a quartz watch, but if it's mechanical keep it out of the ultrasonic.