There are lots of self resetting circuit breakers out there for critical circuits, where the line can go dead and come back on after a set delay.

You can buy the testing tools at any electrical supply house if you really want to. I've seen them in use, just point the stick toward the line in question and it lights up if its powered (inductive amplifier). Those tools are not cheap since a false readng will carry a high price so they are quality made and the companies making them have high insurance.