Set the multimeter to AC voltage
Insert the black probe into the COM port
Insert the red probe into the V port
Turn the multimeter on
Touch one probe to the hot slot and the other probe to the neutral slot
Read the voltage display
Repeat by touching one probe to the hot slot and the other probe to the ground slot
Compare the readings to the expected outlet voltage
Set the multimeter to continuity or resistance if checking grounding or outlet condition with power off
Turn off power at the breaker before continuity or resistance testing
Remove the outlet cover if needed
Test between ground and neutral with power off
Test between hot and neutral with power off only after confirming the circuit is de-energized
Replace the outlet if readings are abnormal or inconsistent