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.

Today on Boiler University's Weekly Boiler Tips, Jude goes over a really easy tip to determine if the air switch on the boiler's blower is working properly.