Smart ruler I made the simple people so that all available. By touching the screen, move the steering wheel left and right with your finger It is possible to correct the error of the pixels of the screen. This application is the most accurate smart ruler. Depending on the device is inaccurate, correction I can (calibration) the application You can convert with one click and support, (mm, inch) of seeds of the two units. Function - If the unit is inaccurate, and compensate for the application - Inches (inch) millimeter (mm) Unit - You can by touching the screen, to the measurement by moving the steering wheel left and right with your finger.