Mousetrap, fault locator.

There was a handy gizmo made to trace intermittent faults that would cause machines to shut down. It was called a Mousetrap.
The Mousetrap would indicate which one of several circuits opened first. A light would come on showing which circuit it was. The unit would run off 110 vac and had a battery to hold the information also. Is such a thing made anymore?
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