Place the tip of the tester near an AC
voltage. If the tester detects voltage within the defined detection range, the LED at the
tip of the tester changes color from green to red. The red LED will continuously flash and
a pulsating beeping sound will be heard if the beeper is activated (refer to Testing with
sound alarm). The flash rate of the LED and the beeping rate will increase as the tester
gets closer to the voltage source.