Features: 1. It is convenient for you to observe which part of the watch is not water proof with the transparent cylinder.2. Designed for testing the water resistance of the watch cases.3. Can test two watches at one time.4. Easy for you to operate.5. It is a great accessory for watchmaker and watch repairing.Specification: Material: AlloyColor: Shown As PicturesCapacity: 2WatchesMaximum Test Height: 15.5cm/6.1inMaximum Test Width: Approx. 7cm / 2.8inExternal Air Pressure Connection: 6NPressure Test Range: 0.3-6.0barCylinder Maximum Pressure: 10 barSize: Approx. 240 * 145 * 275mm/9.5 * 5.7 * 10.8inPackage List:1 * Watch Waterproof TesterUsage:1. Fill the water tank to the specified level. Distilled water is preferred to prevent calcium deposition.2. Hang the watch on the hook.3. Replace the cover and tighten through 2 nuts.4. Use the lever to increase the pressure to 3 atmospheres (according to the official standard of watch industry) and wait 3 minutes to watch the air inside.5. Press the button to let the air escape immediately. When the pressure drops, observe the watch: if almost no bubbles escape from the shell, it is obvious that the sealing is not good for escape.In this case, please get the watch out from the water..