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Morning?Jack. I have found most of them work. Cylindrical ones make great hydrophones. You want some robustness to them as far as thickness. They key is type of material Please see this for more information.?

One of the other things I found is that most vendors assume you are doing something commercial and are set up to be B2B suppliers. They will custom?make almost any size but are interested in large quantity?orders.?

I would?try buying a few and see how they respond to small quantity orders.

Jules