3D Accelerometer is a tool to provide you with a way to see the acceleration data on your phone. An accelerometer is a device that measures the acceleration it experiences relative to freefall.
X-Axis is roll
Y-Axis is pitch
Z-Axis is face up/face down
Yaw can not be determined using an accelerometer because it is a compass value. X, Y, and Z are linear acceleration values that point to whichever way gravity is operating. Together, they form a 3-D acceleration vector that indicates the direction of gravity.
-X,Y,Z acceleration data displayed in G forces and angles relative to the ground
-3D Grid which represents the angle of your phone