Marking system with coding for measuring purposes

摘要

The central circle or the circular ring (2) at its centre has a sight mark, especially a target point, a target circular ring (5) or a target cross. A contrast ring (3) is arranged between the central circle or a central ring, which has a uniform colour, deviating from the colour of the central circle or the circular ring (2). Four tables are provided in the specification giving details of the coding system.