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Yes, get one. Like Matthew said, sometimes the shop's analyzer isn't working. Another issue is you never know how well maintained the shop's analyzer is. If you go on any dive vacations where you dive nitrox all week long, you also don't have to wait for the boat analyzer, if they even have one. I also like to analyze right before the dive. It's not that I think the mix is going to change. It's just my confirmation of the mix I have in the cylinders.
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