You did notice I only used it in the pool, for the purpose of checking timed activities for students and keeping track of the progress of the class in relation to the scheduled pool time. That watch was taken for repairs each time, and it has long since been retired.
I think about that especially when I see people talking about using cheap watches with their 100 or even 200 meter ratings, not realizing that even 200 meter ratings are not recommended by the watch-maker for scuba. I now use a very, very expensive dive watch watch that was given to me as a gift when I go in a pool. It has a 300 meter rating. Of course, I can't use it now. It started acting erratically this week, and I sent it in for a new battery.
On a real dive, I would not rely on anything as undependable as a watch, and I don't use a primary device without a user-replaceable battery. My current primary computer starts giving me a low battery warning several dives before it has to be replaced, and it will put a prominent message on the display that will not go away until I push a button confirming that I have seen it. It can take me as much as two minutes between dives to get out the common replacement battery I carry and put it in the computer. I think that is much more dependable than a watch or common low-function computer/bottom timer.
