The Digital Degree Wheel is an electronic device, with a digital reading, which enable a measuring of the diagram of the internal combustion engine, both of the two-stroke and four-stroke engines, at the tenth degree of precision. It is essential to know precisely all the distinctive corners of two-stroke engine as suction, exhaust, opening and closing of valves, the width of the valves of four stroke engines. It has been made to replace the traditional graduate degree wheel or goniometer and to work out the problem of precision, basic element when preparing competition engines. The PRISMA Electronics already realized in 1995 the first Digital Degree Wheel which then became the standard to measure the diagram of two-stroke engines.