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This is a magnetic switch. If no magnetic field is present, the signal line of the sensor is HIGH (3.5 V). If a magnetic field is presented to the sensor, the signal line goes LOW, at the same time the LED on the sensor lights up.
This is an analog magnetic field sensor module. The strength of the field is given by an analog voltage at the signal pin. The sensor is connected to gnd and 5V of the Arduino board. The output voltage is measured by analog pin A5 on the Arduino board.
when linear Hall magnetometer Sensor senses a key signal, LED lights, otherwise off.
A reed module is a magnetic sensor that is normally open and get closed when exposed to a magnetic field.
This sensor is essentially a reed switch, encased in an ABS plastic shell. Normally the reed is 'open' (no connection between the two wires).