It is convenient for you to observe which part of the watch is not waterproof with the transparent cylinder.
The air pressure can be adjusted up to 6 ATM. This means that you can test the watch with a watertight level of no more than 6ATM.
Principle: By pressurizing the sealed can, the condition of the product can be simulated tens of meters below water. The pressure difference between the inside and the outside of the product is created after the pressure relief of the sealed box. Air bubbles are visible in the leaking product.
Easy for you to use. If the pressure drops, check if there are bubbles from the watch. If bubbles are present, the watch is not well sealed. Pull the rod out quickly and take out the watch. There is no air bubble, the watch seal is very good.
Caution. The air pressure can be adjusted up to 6 ATM. This means that you can test the watch with a watertight level of no more than 6ATM.