Anyone have any experience using a dry pressure tester on vintage?

[Richard Carver]

My research indicates dry testers may be ineffective on sapphire crystal watches but acrylic crystals are easily deformable and should be fairly responsive to pressure testing. I'm not trying to test for diving I just want to be sure they are tight enough for cleaning and a dip in the pool.

I'm going to expand my rotation to include watches I haven't worn in years and this would be a convenient way for a quick test for peace of mind. I know most of you would never stick your baby in a strange machine so warnings not to stick my babies in strange machines are stipulated and appreciated.