Bergeon 5402 Basic Hand Held Waterproof Tester. This a very basic but highly effective tool that is presented at a cost far less than its counterparts. With this apparatus, watches can be tested for water tightness without any penetration of water.

Instructions for use

1. Remove the winding button. 2. Place the winding button on the steel tube of the pump nozzle. 3. Place the watch on the fanshaped support, slightly bending the spring and causing the case pipe to enter the nylon pump nozzle. 4. Pull up the piston as far as it will go, and then release it. 5. If the piston head moves back towards the pump, this means that the watch is leaking badly and will have to be re-examined. 6. If the piston remains quite still, place the tool with the watch in a recipient containing water or, better still, a mixture of equal parts of water and alcohol. 7. If no air bubbles escape from the case, the watch may be considered waterproof.   Bergeon No. 5402