This is a Magnetic Induction Sensor. It senses the magnetic materials within a detection range up to 75px. The detection range and the strength of the magnetic field are proportional. The output is digital on/off. This sensor uses the SFE Reed Switch - Magnetic Field Sensor.

Features:
Convenient and easy to use.
Detection range and magnetic field strength are proportional.
It is very suitable for working for Arduino to build a circuit prototype.
Excellent board and great quality!
Suitable for all kinds of scientific experiment research for Arduino.

Specifications:
Brand: Keyestudio
Model: Hall Magnetic Sensor
Material・FR4
Color: Black
Working Voltage: +5V
Detection Range of Sensing Magnetic Materials: up to 75px
Output: Digital on/off
Item Size: 3 * 2 * 0.7cm / 1.2 * 0.8 * 0.3in
Package Size: 5 * 4 * 0.9cm / 2.0 * 1.6 * 0.4in
Package Weight: Approx. 2g / 0.07oz

Package List:
1 * Hall Magnetic Sensor Module for Arduino