Edwal Hypo Check tests your fix solution for exhaustion due to silver saturation.
One or two drops will test the fixer and, if the fixers still OK, no harm has been done to the bath.
If the addition of Hypo-Chek produces a cloudy precipitate, the bath is exhausted and the fixer should be discarded.
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I hope you're all checking your fixer strength. This is what you do it with.
As it gets more difficult to keep essential darkroom chemicals on hand, B&H is an excellent source. This protect is very helpful to avoid using exhausted fixer. It also saves money by using fixer to full capacity.