if you want something accurate and small, check out the vintage diving gear on ebay. Sometimes they have working analog depth gauges for bid. Don't think you will be able to attach it to a watch strap though.
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Ok, can't seem to find the Timex model anymore...
But I'm now on the hunt for the Casio SPF 100 1v
Is anyone selling this here in the Phil? New or used is fine.
Ok, I did find this one that fit my needs... what you guys think? HAHAHAHAHAHA
Now... to afford this... I'll have to sell all my dive gear, and not go diving again...ever...
HAHAHAHAHAHAHAHAHA