Magnesium Test Kit

What are you using to test for Mag?

My red sea Mag test is very old and reading levels off the chart, which doesn't seem right as I am not dosing for mag. (Im sure the test has expired)

I am using Hanna checkers for calcium and alkalinity. Any recommendations on best test kits for mag?
 
Red sea kits only have 2yr life span at best says red sea. I us salifert now. And easier test and easily repeated imo
 
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