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I never bought one. I would recommend that you not buy one unless you are going to do your own Nitrox fills. The LDS or filling station will have (are supposed to) an analyzer you can use. Most require you to write down the tank number, fill pressure, MOD/PO2, date, and your name, ohh and then sign your name.
I hope this helps.
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Please PM me if you need any help.
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