-hh
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Charlie99 once bubbled...
My 100M (Casio) watch, did fine at 143', and has spent lots of time below 100'. I wouldn't trust it to those depths after replacing the battery, but the battery life is long enough, and I put enough dings into the crystal watch face that it is time to get a new one after 3+ years when the battery wears out. YMMV
I pick up cheap Casio's for my dive watch. For fancier stuff, I rely on my dive computer (and instead of buying the expensive PC interface, I picked up a SENSUS PRO data logger...$110 complete).
Anyway, the Casio 100m watches do fine diving if you just remember to two things:
1. To resist the temptation to push any buttons anywhere other than on your safety stop.
2. To always take it to a genuine Casio Factory repair shop when it needs a new battery (around $10).
I had a $40 Casio TS-1000 that went ~15 years and a half dozen factory battery changes...figure <$10/year lifecycle costs...before I made the mistake of not checking it long enough in advance of a dive trip for the factory's typical ~2 week turn around. I had a local jeweler do the "While-U-Wait" battery change and it flooded on the very next dive.
If you want to refine this technique a little further, the factory provides a 30 day guarentee after the battery change - - just take it in to have its dead battery replaced ~3.5 weeks before your dive trip, or whatever's appropriate for your local Factory repair shop's turn-around. Just plan to get it back ~1.5 weeks before your trip (a safe margin). This gives you the factory 30 day guarentee in which they'll give you a free replacement watch in case they messed up their battery replacement.
-hh