A History of Ultrasonic Record Cleaning

Which Elma product would you buy for cleaning LPs? I looked at their website. It seems they make a very wide variety of ultrasonic cleaning machines, but most of them are for various industrial purposes. Thanks.

@lewm- Tim, in this article I published, switched from a cheap Chinese unit that crapped out after a year to the P120, see [url]https://thevinylpress.com/timas-diy-rcm-follow-up-2-compelling-changes-improved-results/[/url].
@Terry9-if memory serves is using a Fisher Scientific branded Elma version of the P60, which as Terry could probably explain, is a tight fit for two records, but I gather works well, and is less pricey due to its smaller size/capacity.

Whart, maybe you could try to actually damage a few records with the ultrasonic. What would it take or is it possible at all ?

Too low a frequency for too long; if the record doesn't rotate, the cavitation effect focused in one spot could cause damage. I think the literature on ultrasonic cleaning for industrial purposes (non-LP) could be a starting place to look at the risks, which might also include water temperature. I haven't really thought too much about how to damage but it's the flip side of not damaging; lewm raises a fair point about potential damage; we've all engaged in a leap of faith based on manufacturer statements and user anecdotal experience. That's not going to satisfy someone who wants "proof." If I had time, I could ask or explore more; there is a point where experience in cleaning metal parts doesn't translate, but I suppose if it damages metal it is bound to damage vinyl. 

Although,I wasn't trying, but left 2 different but brand new lps in my 40hz cleaner @ 45C for 45 minutes with my spinner off. When I realized it after those complete cycles, I put them through the exact same cycle with the spinner on, then listened. I heard nothing that concerned me.