For regs, don't discount Dive Rite. They are very similar to Apeks, Hog, etc., plus you can get service kits from DGX if you want to do your own.
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How old/young are they?My Apeks are TX100 and TX50, so they predate the ATX series, I believe.
Save the money and get a new computer if you are not already diving with two.They were purchased in 2000. I wasn't planning on a Christmas present, but maybe next year...
It was more looking for the makes/models that would be simplest to work on, as $150+ to get them serviced hurt.
Save the money and get a new computer if you are not already diving with two.
Apeks is very very easy to service(DIY) as long as you can get both service kits! The only "special" tool is the C-spanner but it is not that difficult to find it in good hard ware store.
Plenty of info on line and may be even on youtube!
Good luck