Open the hood and find a place to set your multimeter. Open the coolant reservoir or radiator cap to access the coolant. Pro Tip: If you don’t see any coolant in the reservoir, or at the top of ...

[Rajendra] tipped us off to this really slick hack he’s done to allow his multimeter to tell the ambient temperature. He’s basically measuring the output of an LM35 temp sensor that he has ...

Automotive circuits will use either, depending on the circuit. To test the battery, you’ll want to use the DC voltage setting. This will be illustrated by a ’V’ with a straight line beneath it.