A free magnet tesla meter app that measures magnet magnetic flux density in micro tesla (μT) units using a three-dimensional magnetometer. The upper side of the screen is the X axis, the right side of the screen is the Y axis, and the front side of the screen is the Z axis. Magnet S pole is positive, magnet N pole is negative. Maximum value for northward, minimum value for southward. 100 μT = 1 Gauss