Every experienced diver knows sometimes novices forget to take care about the amount of air the still have. Divemasters always ask their groups during their briefings to tell them whenever they reach half the capacity of the air tank, but once and again it is so frequent that novice divers get distracted and forget to do it.
It would be really useful to have any mean to know that your buddies (or yourself) are close to start using the air reserve, the same way cars indicate you are using the fuel reserve.
This would be as simple, as having an air tank level indicator,
a bright blinking light, which would
turn on or change colour when close to (and before) start using your security air reserve.
This would be really cheap to build and would give a big profit margin for any company.
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