Automatic shut-down

When the test pen does not detect any voltage within 5 minutes and the AC does not take any action, it automatically turns off.
Sound and light real-time identification or blank line:
- Solid line test:
The sensor end of the measuring pen is close to the object to be tested, the fast-paced buzzing alarm test sounds an alarm, and the display flashes red, indicating that the test is a solid line.
- Empty line test:
The sensor tip is the empty line of the test line, indicating the object to be measured, the slow buzzer alarm, and the display flashing green.