Magnetic Sensor is a free Android app developed by Tsiantakis Apps that helps you visualize the X, Y, and Z axes of your device's built-in magnetic field sensor. With a simple and easy-to-use interface, this app provides accurate readings of the magnetic field strength in your surroundings.

This app requires Android 1.6 or higher, at least 3MB of memory, and a built-in magnetic field sensor. Once installed, it displays the magnetic field strength in microtesla units and allows you to switch between the X, Y, and Z axes. The app also features a simple graph that displays the magnetic field strength over a period of time.