This program gives a reading in milliGauss mG of the magnetic field readings in each of the 3 axis X,Y amp; Z from the magnetometer in your phone from zero to 20,000 mG in five ranges.The top number is the highest reading of the three axis39;.The three bar graphs show each axis separately. A green graph means the reading is positive and a red graph means the reading is negative .The program defaults to AutoRange whe n started and will selecta range for the bar graphs based on the axis with the highest reading. One of five manual ranges can also be seleected. Selecting a low range and effectively quot;overloadingquot; the bar graphs will not cause damage to your phone. Accuracy of this software will vary from device to device and is not guaranteed. This software is intended for entertainment purposes only and not intended for use as a replacement for calibrated scientific instrumentation.