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Waterproof Testers - Old Habits Die Hard We still think of them as waterproof testers. There are three types of testers, 'controlled immersion', 'case deformation' and 'case only wet tester'. Controlled Immersion - for testing between 3-6 bar, Models HW41 & HW46 The watch is suspended above the water line in a sealed container half filled with water. The container is pressurised, normally by hand pumping, to the rate required which in turn will increase the pressure inside the watchcase if it is not watertight. The watch is then lowered into the water and pressure is reduced by pressing the escape valve. Any leak will be seen as the pressurised air in the watch escapes into the water as a stream of bubbles. If the watch is not water resistant the escaping air will stop the water from entering the watch but one must be ready to withdraw the watch before the pressure becomes equalised. Case Deformation - for testing between 3-11 bar, Models HW44 & HW47 Pressure & Vacuum The watch is isolated in a pressurised container without water and any weakness in the case's structure, glass, case back, case crown and pendant, will become apparent when pre-selected pressure or vacuum tests are applied. Although our HW44 tester also requires a separate compressor, the automatically operated testing to clearly defined parameters, with the option of a printed confirmation of the results, makes this tester the first choice of most service and production units. Vacuum Only Our tester HW47 works in a similar way to our more popular pressure and vacuum units. By reducing the pressure surrounding the watch the normal air pressure inside the case will deform the case and this deformity can be measured to accepted tolerances or not depending on the state of the watch case. Complete with inbuilt compressor this quality made German unit is ideal when confirming the water tightness of the case up to approximately 5 atmospheres. Case Only Wet Tester - for testing between 3-40 bar, Model HW42 Another anomaly, in reality it should be titled 'case first, watch afterwards, wet tester'. Normally used for confirming the water resistance of accredited divers' watches. Initially the case is immersed in water and after ensuring the testing tank is securely fastened, pressure is increase to the level required. If no water has entered the watchcase the test is repeated with the movement in place. Finally Testing the water resistance of watches will cause your workshops to explore the wide range of materials and accessories that will occasionally be required in your aim to meet the demands of your water-loving customers. Fortunately Walsh have the answer in their wide stocks of waterproof (there we go again) seals, buttons, pendants, glasses, gaskets, compounds etc.