How to Use a Low Voltage Circuit Tester

Low voltage circuit testers are used on electrical components that are designed to carry a low level of electrical current.

Low voltage testers are smaller and simpler than high voltage ones.Low voltage testers are smaller and simpler than high voltage ones.
Electrical cables and harnesses are just a few of the many things in your home of office that have low voltages. A circuit tester can tell you just how much current is running through those cables before you hook your appliances up to them. Too much current can damage the devices, while too little will prevent them from working properly.

Check the specifications of the cables or harnesses that you are checking to see what the electrical voltage is supposed to be.

Make sure that you are standing a safe location. Electricity can be dangerous, no matter how small the voltage; do not stand in any water or on wooden boards when using the meter. A concrete floor or insulated pad is best.

Connect the black lead line on the tester to the grounded component of the cable being tested.

Connect the red test line to the live cable being tested and read the voltage on the meter.


  • Always disconnect the red line from the testing meter first.


  • When working with electricity, make sure to have another person nearby in case of an accidental electrocution.

About the Author

Amanda Hevener has been a freelance writer and photographer since 2006. She is a member of the Akron Press Club. Her writing has appeared on SeededBuzz,, Baseball Fandom and Deep Left Field. She reviews restaurants for AltOhio and other websites. She has a Bachelor of Arts in journalism and English from Ashland University.