Hall Effect Sensor is a sort of non-contacting position detector. They are either linear or removable and since they're non-contacting, they're free and possess virtually unlimited life.
Basically, hall effect sensors work where a magnet is aligned with the Hall Sensor electronics. After the magnet is rotated the magnetic field varies along with the electronic equipment convert this to a comparative positional output. In the event of a linear hallway, the stroke is limited because of this principle however, the purpose is fundamentally the same.
They are highly reliable.
Offer pre-programmable electrical angles and outputs.
Offer high speed operation.
Something to take under account when choosing a Hall Effect sensor is that the encompassing region of the program because these detectors may be impacted by outside factors interfering with the magnetic field.