For automotive circuits, we recommend an auto-ranging meter with at least 20MΩ of internal resistance. Make sure to use the correct multimeter setting for a car battery.

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.

A Selective Catalytic Reduction (SCR) meter from Gentech can be equipped to measure the presence, level and temperature of Diesel Exhaust Fluid (DEF).