Pressure Testing?

Where do you go to get a watch pressure tested? Can any jeweler/watch repair shop perform that task? I wouldn't think I'd have to send a watch off to the manfuacturer to do this, do I?

I've recently bought a few pre-owned watches that are in nice shape. Some were serviced before I got them. But I'd like to have a "baseline" for myself, so I know they are properly sealed before I wear them in the rain, the pool, the ocean, or even wash the dishes.

Thanks,
Steve