Hello reefer! Whats the difference in the Red Sea MCP Master test kit black box vs the grey box? I'm confused as the grey box has more tests but is the cheaper of the two. I was hoping to post pictures but RC randomly doesn't give me the option down below. Tia.
I am not sure which products you are seeing. Red Sea has their Pro test kits, which I think are a bit more precise and accurate than the other tests, and they sell refills for the test kits. Some example links might help.
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