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Thanks to everyone - of course these are very precise calculations - but the method is not part of the translation. This keeps the same level of information. 4 KudoZ points were awarded for this answer
Bourth was on the right track - it's 1/10 millimeters. If there's multiple ultrasonic transducers they need to be accurately positioned or they will be out of phase with each other and the shot won't shoot :) BTW 5/10 = 20 thou.
I WAS going to say that in my experience, in my fields, "10èmes" usually refers to 10ths of a millimetre ... But I still don't see the connection between "positionnement", "acoustique", and your machine ...