cracking iso 6425
DIVE WATCHES ARE REGULATED BY ISO 6425 AS FOLLOWS:
The bezel is not only rotatable but also marked with a five-minute elapsed time indicator. This is extremely useful to mark dive times.
The minimum water resistance required is 100 meters. It is also advised not to pull a watch crown during a dive to prevent water penetrating the watch.
glow in The DaRk
The watch can be read at a minimum distance of 25cm in total darkness. This is where the Super-LumiNova glow-in-the-dark coating comes in.
The watchcase has to withstand rust, corrosion and changing temperatures. The watchband can be made of either rubber or stainless steel.
There should be a time indicator that shows the watch still functioning during a dive. That is why most dive watches have a seconds hand.