Geometrical product specifications (GPS) – Workshop plug gauges and spherical plug gauges for inside diameters with tolerance class according to DIN EN ISO 286-1 and DIN EN ISO 286-2 from 1 mm to 500 mm nominal size – Deviations and tolerances for gauges
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 03/01/2017

Workshop Plug Gauges and Spherical End Measuring Rods for ISO Fit Dimensions from 1 to 500 mm Nominal Dimensions; Gauge Dimensions and Manufacturing Tolerances
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1966