This classification covers specialized measuring tools other than calipers, micrometers, and dial gauges. It includes precision measuring instruments such as pin gauges, block gauges, thickness gauges, feeler gauges, thread gauges, limit gauges, surface roughness testers, hardness testers, torque wrenches, angle meters, levels, square rulers, and surface plates. These are professional measuring tool groups used for dimensional inspection, quality control, and equipment maintenance in machining operations, primarily consisting of JIS standard products and high-precision products with calibration certificates.