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FWIW; Hach makes this Cu test kit which works with both fresh & saltwater: http://www.hach.com/copper-free-total-color-disc-test-kit-model-cu-6/product?id=7640217308
And there's also this one by Chemetrics: https://www.chemetrics.com/index.php?route=product/product&product_id=392
Both are considered more accurate/reliable than "hobbyist grade" Cu test kits; I'm also told the Chemetrics one is easier to read than API, Salifert, Seachem, etc.
And there's also this one by Chemetrics: https://www.chemetrics.com/index.php?route=product/product&product_id=392
Both are considered more accurate/reliable than "hobbyist grade" Cu test kits; I'm also told the Chemetrics one is easier to read than API, Salifert, Seachem, etc.