High Voltage LED – You can find it on the left side, and it will make a beeping sound and glow when you are testing high voltage. (2) Continuity LED – You can find it on the right side, and it will make a beeping sound and glow when you are testing for continuity. Non-contact Voltage LED – You can find it in the middle, and it will make a beeping sound and glow when you use the fieldpiece meter's non-contact voltage feature.