The German Ordinance on Industrial Health and Safety (BetrSichV) stipulates that working materials must be inspected ( 10 (2)) Type, scope and intervals of the necessary inspections have to be determined by the operating company ( 3 (3)). In this guideline, standardised minimum requirements are determined and a standardised inspection concept is introduced. This concept states the valid acts, standards and rules and determines the procedure of the inspection. It is suiteable for the assessment of inspection services offered on the market.