fixer test solution tells you...?

Does fixer test solution identify fixer that is too old in addition to fixer that is too used? I've got some fix that has been around longer than 2 months in a less-than-full bottle. However, while I know that the test solution will tell me if it has too much silver in it to be effective, I don't know if it will tell me if its too old (too much oxidation?).

Thanks

ben

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