What Is a Multimeter? A multimeter is a tool that measures electrical properties like resistance, voltage, and current. It is used to test electrical components such as diodes and capacitors.

Learning how to test glow plugs ensures your diesel engine remains reliable and efficient. Here is how to test glow plugs.

A good multimeter is great to have around the house for electrical projects and a nice addition to your toolbelt. Here's the best rated one from Harbor Freight.