1.If you find that the reading is not accurate, please slide the LCD screen to the left ("0" on the scale), and then press the zero button.
2.The number is bounce or no display. It may be that the battery is exhausted or the battery is in poor contact. To replace the battery, remove the battery cover, or adjust the negative spring with tweezers
3.The digital display is irregular. The caliper may be damp. You should wipe the ruler or open the case to dry, and then replace the battery