An essential tool for testing light switches is a continuity tester. You also can use a multimeter by turning the dial to read “continuity.” ...

For all of you who have a multimeter thrown in a drawer or toolbox but don’t know how to use it, these instructions will help in your search for missing voltage.

Keithley Instruments has added the Model 3731 6×16 switch-matrix plug-in card to its Series 3700 switch/multimeter family. The company says that the card's voltage and current characteristics (200 V, ...