IWC Schaffhausen AQUATIMER DEEP TWO Operating Instructions Manual page 32

Inaccuracy in the depth gauge
50
40
30
20
10
0
0
First set the depth gauge to a value
below zero (for example –2 metres).
Then reset the maximum depth indicator
(press the reset button (13)).
By turning the adjustment crown (10),
the depth gauge can now be set to zero.
Tolerance range
1 2
Excess pressure in bar
3 4 5