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| NO. | Fault | Possible reason | Solution |
| 1 | LCD does not light up | Battery too low | Replace battery |
| 2 | The measured static voltage value is abnormal or the error is too large | There is high-voltage equipment, ionization equipment or strong electromagnetic equipment around. | Remove high voltage equipment, ionizing equipment or strong electromagnetic equipment. |
| Detection distance setting error | Detection distance is 25mm | ||
| Meter test orientation is not appropriate | Confirm the correct test orientation, the plane of the detection window is parallel to the surface of the object. | ||
| 3 | The product has an odor | Component burning | Return to factory for maintenance. |
| 4 | If there are other problems or if the problem can’t be solved through the above solutions, please contact the manufacturer or distributor. | ||