They might be useful for ammonia as a rough warning in case it rises, but I would not rely on them for anything else you need to measure in reef aquarium water.
The LFS I used to work at used test strips to test everything. I found them to be inaccurate, at best (and I never recommended them to customers...probably one reason why I got fired). You could test the same water twice and get different readings for the same thing you're testing for. Then, there's when the little square doesn't change completely in the center, it's two different colors.
Go with the test kits that make you look like a mad scientist!
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