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It comes down to trust. If you can honestly trust the analyzer in use at the shop or boat, you probably don't need one.
If you have ANY reason to suspect the analyzer is not being well maintained, it makes sense to own your own.
I have one, and I'm glad I do, but I don't use it all that often, since I actually do trust the shop's analyzer. I usually use mine on boats, however, since those are often exposed to pretty harsh elements, and having my own and not having to use the boat's analyzer can come in handy. Plus there was that one time that the boat's analyzer died and mine saved the day...
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