Magnetic Pole Identification Pen NS Recognition Detects magnetic field strength with an induction switch. This module can be powered by a Type-C interface +5V and connected to a power bank. Alternatively, external power can be supplied via the positive and negative terminals of a 2.54 through-hole, with a voltage range of 3.3~40V. The working principle of the linear Hall module is: its input is the magnetic induction intensity, and the output is a voltage proportional to the input. Name: Hall Sensor Material: PCB Suitable for: College students/engineers/technicians/factory personnel DIY/electronics enthusiasts and other operations. Note: Keep away from magnets during the product's self-check after the power switch is turned on. Color: Black Package Contents: 1 x Hall Sensor Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3 cm.