Accurately test and troubleshoot electrical voltage, current, and resistance with this must-have tool.

It's a must-have for any toolbox—but there's a learning curve involved. Learn how to use a multimeter for all of your electrical testing needs.

These three tests should be in your preventive maintenance program for medium-voltage circuit breakers: 1. Contact resistance test. Use a digital low-resistance ohmmeter (DLRO), not a digital ...