- No need to rotate while measuring.
- The red light was sealed with a setting red-glue; it can concentrate the light and resist water.
- The sensor beeps while the red light is on.
- The sensor will deep when the user couldn't see the reverse side or get a clear sight.
- Example: If the sensor's light is working, visually you couldn't see inside of the inner hole while probing the user can be warned by the beeper.
- When probing the deep hole, you cant see the red light, but you can hear the sound from the beeper.
- Accuracy: within 0.005 mm.
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