Snap-on’s Digital Display Circuit Tester (EECT400) is designed to detect voltage, ground and circuit integrity.

If you're having circuit breaker issues, you'll want to use safe troubleshooting tools. Luckily, Klein Tools has several to choose from at different prices.

First, verify that the tester works by checking a known live circuit. Hold the tester to a powered appliance or lamp cord, or insert it into a receptacle (use the smaller slot, which is the “hot ...