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cuprion is a chelated copper so you will need the API test kit for that.
It's actually pure copper sulfate with a very low therapeutic level: 0.20 ppm.
You can sometimes read it using Seachem or Salifert; but it is recommended to use one of the "professional grade" test kits listed here: https://www.reef2reef.com/threads/copper-test-kits.257924/