This standard specifies the terms, definitions, types, basic parameters, requirements, inspection methods, marking and Encasement of strip and frame levels. The standard applies to levels with scale intervals of 0.02 mm/m, 0.05 mm/m and 0.10 mm/m and specifications of 100 mm to 300 mm. These levels take readings through a leveling bubble and are used for accurate measurement of plane levelness. The standard provides detailed technical specifications to ensure the measurement accuracy and Reliability of the level.