Inspect the tester for damage before use
Verify the tester works on a known live source
Insert the probe tips into the test points or outlet slots
Hold the tester by the insulated grip only
Observe the indicator lights or display
Confirm the voltage range shown matches the circuit
Test both hot-to-neutral and hot-to-ground when applicable
Recheck the tester on a known live source after testing
Turn off power before touching any conductors
Store the tester in a dry, protected place