The video shows a person using a red multimeter to test a car battery. The person connects the red and black wires of the multimeter to the positive and negative terminals of the battery. The multimeter's display shows a reading of 14.68 volts, indicating that the battery is fully charged. The person then disconnects the wires and the display returns to 0.00 volts. The video provides a clear view of the multimeter's display and the person's hand movements as they perform the test.