Avoid the API GH test kit. My experience was that the colors were very dim, and the kit has a very short shelf life. As I recall, the Tetra kit was a good one, and the Nutrifin kit I recently bought on Amazon, has worked well.
You can never go wrong with LaMottte. I had a few LaMotte kits from the early 90s that have been in storage since then. The Nitrate kit did not register, but the Calcium kit read 40 ppm which is exactly the same with a brand new Nutrifin. While the LaMotte has minor divisions for more accurate readings that we really do not need, I would still recommend the LaMotte Calcium hardness kit just because the reagents do last. That having been said, the Nutrifin is just as accurate for our purpose.
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