I agree with Geistware and Gremlin, Voltwatchs can be quite useful when properly used and are much more apt to be used than a loaded voltmeter. Nothing against loaded voltmeters, again very useful if properly used. If you pay attention to the flickering (lowest LED lit) when exercising the sticks, the voltwatch will pick up problems that the loaded voltmeter will not. If you are in doubt, be a belt and suspenders type, use them both.