I usually recommend newbies have the LFS test their water for them. But yeah, after they've been in it for a few months and think they are going to stay in the hobby, then its time to get test kits to do it at home.
Once in a blue moon I'll bring my water sample in to the LFS to get it tested but that's mainly to verify my own. I also get a good friend of mine with Hanna checkers to test for certain elements because those are supposedly more accurate than the Salifert kits I use.
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