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I don't have one yet...but I will get one. I think if you dive Nitrox frequently, or have multiple tanks it's a good idea to have to avoid any confusion as to what mix you're using. My fiance and I both dive nitrox and have multiple tanks between us. Often times they are filled with different mixes. It's just another safety to make sure you have your numbers correct before diving. Not to mention that I've heard a mix can change slightly over time. I've never experienced this, since my tanks don't usually stay sitting full for that long.
Shane
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