For anyone who is an avid diver, this is very cool, they only made 100, . Nitrox is a certification that you have to get every answer correct before you can get your card. It basically gives you just a little more oxygen but !!! allows you to go to 100 ft and hang out for 15 minutes. Regular dive profile doesnt allow you anywhere near that much time. I LOVE this watch, hurry up and get one as they have only made 100
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