I agree with David as I use the same. I've been reading and the Elos kits are pretty accurate, but a lot more expensive and I dont think the kits last as long. API are cheap and easy kits though. All kits have their advantage and disadvantages
I use api for calcium, salifert for Mg, and the TM for alk. I had another CA test kit, instant ocean i think. it was kind of a pain to use but got the same results as the api.
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