The Cypres 2 is waterproof up to 15 minutes down to a depth of 15 feet ( 5 meters). This is achieved through a water-resistant casing, sealed plug connections, a sealed cutter, a sealed control unit, and a special filter. The filter allows precise measurement of the air pressure and at the same time keeps the water away from the inside of the unit. As long as there is no contact with water, the filter never needs to be replaced by the user.
After water contact, the filter must be removed and discarded, and the new filter must be installed.
(Each Cypres 2 comes with one spare filter and the filter changer, a stainless steel tool to screw the old filter out and the new one in. This procedure takes about 1 minute.)
I1530 contains only one replacement filter.