Bulova Waterproof Tester
I found this at our local NAWCC meet, and it was inexpensive so I thought it would be a good item to add to the DB as a Bulova Accessory or tool/test equipment.
Original box and manual. The idea here is to spread the 'Detectaire' along the seams and around the crown, and then put the watch on the rubber pad. The heavy glass dish is then placed on top, and the handle is pulled down to create a partial vacuum.
The air pressure around the watch is suddenly less than it is inside, and if the watch leaks, bubbles will be seen in the 'Detectaire'. (Soap)