User manual
33
Comment: Only tighten the top strap at the forehead to prevent if from being loose. If the top strap and the
upper rubber straps are excessively tightened, the mask will press tightly against the diver's chin resulting
in chin fatigue with accompanying headache and/or jaw pain.
7. Read the pressure gauge. Breathe in deeply to automatically activate the safety pressure (if this is used),
or alternatively press lightly on the vent button. Stop breathing and listen for signs of leakage.
Comment: If there is leakage when a dry-suit is used, you must check that the dry-suit's face seal has an
appropriately smooth surface design to t against and provide a good seal with a full-face mask.
8. Check the overpressure function (if this is used)
by holding your breath and placing two ngers
between the edge of the seal and your face; you
should hear a strong airow sound.
9
. Check that you can equalize pressure (ease the pressure
in your ears) by pressing the breathing valve upwards
so that the pressure equalization cushion reaches your
nose.