For centuries speed sensors have been used to determine the speed of moving objects. A Technological Need

As time and technology progressed however, the need for other types of accurate speed sensors developed. How can a magnet detect and transmit the speed of a moving object?

It is not just the magnet in a magnetic speed sensor that is used to determine speed but an electrical current that surrounds the magnet as well. An Electrical Current

Gear Toothed Magnetic Sensor

Often a gear is used in conjunction with a magnetic speed sensor. The faster the gear spins the faster the electrical pulses the sensor sends and thus a speed reading is made.