No water
Don't let the point-reading pen get into the water, which will enter the circuit board, damage the camera lens and reduce the reading sensitivity of the point-reading pen.
Don't bump
Don't hit the point reading pen with gravity on a hard object. Strong impact can easily damage the protective shell of the point-reading pen camera. When the protective head of the stylus is damaged, the stylus camera is easily hit, damaging the solder joints and circuits.
Timely charging
When the reading pen is low, it should be charged in time. If the point reading pen is not charged for a long time (more than three months), it is easy to damage the built-in lithium battery and make it unable to charge.
Reset restart
The point reading pen is a small learning computer. Under normal circumstances, abnormal use will occasionally cause the point reading pen to crash. At this time, please hold down the reset switch (a small hole) of the point reading pen with a toothpick or other sharp object for a few seconds, or plug in the power charger for a few seconds to reset and restart, and the point reading pen will resume normal use.