A thing to keep in mind about buying your own analyzer is that you're going to need to replace the sensor every couple of years, about $100, whether you use it a lot or not at all. For someone who doesn't dive a lot it might not be worth it.
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A group of us had a whole-boat charter in the BVI for a week, and had to dive air all week because the boat's analyzer was broken. Several of us had analyzers -- but did not bring them on the trip. We won't make that mistake again!Not having one leads to poor decision making when you forget to analyze at the shop, or the boats analyzer "broke that morning."
but I ask myself do most divers need an analyzer at all.
Ditto.I've had more under-pressure tanks than a bad nitrox fraction (fortunately zero of those).
I feel like you don't need it until you need it, but man when you do it's sooooo nice to have one.