Null Wire Testing：The buzzer will give a slow alarm when the end of the tester is close to the object being tested. The red indicator light flashes slowly and the LCD shows green. Indicates that the tested line is a Null Wire
Live Wire Testing：The buzzer will give a quick warning when the end of the tester is close to the object being measured. The red
indicator light flashes quickly and the LCD shows red. This indicates that the line being tested is a live line.
Breaking Point Test：Move the NCV tip of the tester along the wire, if the voltage alert signs disappear, that is most probably the breakpoint.
LED Flashlight：You can press and hold the “S” button for more than 2 seconds to turn the LED flashlight on/off, and then quickly use it to find problems in the circuit. The LED flashlight provides convenience in a dark environment.