Pressure Testing a watch is based on a very simple principle. It is exactly like looking for a puncture in a bicycle tyre. The watch is suspended in the air above the water and put under pressure. Lower the watch into the water and let the pressure our shows any leaks as a stream of bubbles.
But saying that there are a few things to know before starting pressure testing watches.

When to pressure test a watch or not is a personal choice that is entirely up to you. If you guarantee a watch waterproof you have to bare in mind one day you may get it wrong. I guarantee only watches i know I can replace the movement easily and cheaply. I advise the customer about the shortcomings of a pressure test before doing it and then suggest that they test the watch themselves in a swimming pool before going in the sea.

only then will I agree to do a pressure test (instructions for pressure testing a watch)

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