Test watches under normal conditions of wear without inducing water into the case. Plexiglas cylinder is designed not to crack while tightening the knurled hatch.Cylinder base is beveled and has additional O-ring gaskets to provide and airtight enclosure. It is easy to dismantle for cleaning the hatch,cylinder and base. Test watches under normal conditions of wear without inducing water into the case. On the counter, the waterproof tester enables you to give the customer a quick and convincing demo and assurance water resistance is total. Air pressure system. Tests up to 9 ATM. Newly designed plexiglas cylinder with double seals. Specifications: Dimensions:24*14*27cm. Stable case metal base. Opening diameter: 67mm. Capacity: 130*67mm,two watches.