This project will use a Hall Effect sensor and an I2C LCD display to output the magnitude of a magnetic field in units of Gausses. A 49E linear Hall Effect sensor will be wired to the Arduino which will take the analog input from the sensor and convert it to Gausses. This particular sensor will be of use because it outputs a value proportional to the magnetic flux density (the strength of the magnetic field) through the detector. This value can be used the calculate the magnitude of the magnetic field around the sensor. The output increment output by the sensor for a 1 Gauss increase in field strength and the baseline output for a 0 Gauss field will have to be taken into account. The calculated value will be displayed on the LCD screen.