Take the guesswork out of setting up you wireless and VSAT installation . Just set the unit on a flat reference surface, press the ZERO button to calibrate the display then attach it to the Antenna, fence, etc. and precisely adjust to the desired angle. The Angle Cube is CNC machined to a squareness of 0.0005" and uses a U.S. made navigational sensor that is compact, offering 0.2 degree accuracy with a resolution of 0.05 degrees at a range of 90 degrees. The large LCD screen makes it easy to read while strong magnets hold the unit to any steel or cast iron surface. Spare battery included, measures 2 3/8" x 2 3/8" x 1 3/8".