
The PTB Testing Instructions are intended to serve as a basis and guideline for the testing of measuring instruments and apparatus. The substantial part of the Testing Instructions thus is the detailed description of the testing procedures, the standard devices required and other testing means. As far as useful, the design of the instrument types and special features important for use are also dealt with. The PTB Testing Instructions cover not only measuring instruments acceptable for verification and certification but other types of measuring instruments and objects are also tested by the PTB. The Testing Instructions are intended not only for verification authorities, state-approved test centres and supervision bodies but also for the test laboratories of industry and economy. They will also be useful when test centres and measurement rooms are established and for teaching purposes.