Magnetic North South Pole Identification Pen NS Recognition Detecting magnetic field strength induction switch This module can be powered by Typec interface+5V and connected to a power bank Alternatively, external power can be supplied through 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<br><br>Name:Hall Sensor Material: PCB Suitable for:college students/engineers/technicians/factory personal DIY/electronic enthusiasts and other operations Attention: Keep away from magnets during the self check process of the product after turning on the switch Colour:Black<br><br>Package Contents: 1 x Hall Sensor Module<br><br>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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.