Linear Hall means that the output voltage of the linear Hall is proportional to the magnetic field strength passing through it. The output voltage rises or falls according to the polarity and strength of the magnetic field. When the linear Hall is in zero magnetic field, its output voltage is half of the power supply voltage. When the S magnetic pole senses the silk screen mark surface, the output voltage will increase linearly with the increase of magnetic field strength. On the contrary, the N magnetic pole will make the output voltage decrease with the increase of magnetic field strength.