Reading a watch pressure test

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Hi all,

I’ve had my 1601 checked by a watchmaker, who also test the water resistance (I did not plan to swim with it, but still good to know I can wash my hand without worrying too much !)

I understand the first two lines, with the pressure during the test, and the deformation of the glass and case back.

But what does the last line meaning? How to understand the % / min?

I had look for this information but did not find any clear explanation, maybe someone would be able to explain :)

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