IWC Schaffhausen Aquatimer Split Minute Chronograph Mode D'emploi page 20

The technical refinements of the
Aquatimer Split Minute Chronograph
Your IWC watch shows you the time in hours, minutes and seconds as well
as the date. With the integral chronograph, you can measure any period
up to 12 hours in seconds, minutes and hours. The duration of a dive can
be read on the bezel inside the case, which can be adjusted in an anti-clock-
wise direction by turning the reset button. You can use the Split Minute
function to mark the start of a decompression stop. The mechanical
movement with automatic winding has 30 jewels (synthetic rubies) and
a power reserve of at least 44 hours when fully wound. This watch is
shockproof, water-resistant 12 bar and is protected by a sapphire glass
of hardness grade 9 on Mohs' scale. To ensure that this extraordinary
watch continues to perform its tasks in the future, it is absolutely essential
to observe a few important operating notes.