It is application for measuring length and distance with various method. Main Function 1. Various measuring method : Gravity Sensor, Camera, Touch screen and Acceleration Sensor. 2. Calibration : Calibration function makes easy and accurate measure when measuring angle with sensor. Instruction 1. Ruler Mode 1) Use screen ruler as normal ruler. 2) Get exact length by touching screen. 2. Measuring Tape Mode 1) Set parallel measured object and device. 2) Drag device with screen touch.