A professional who inspects, tests, and adjusts new and reworked tools, dies, gauges, jigs, and fixtures, for conformance to specifications, such as dimensions, tolerances, and hardness, applying knowledge of tool and die design, shop mathematics, and machining and testing procedures, using precision measuring instruments, testing equipment, and handtools. Respnsibilities include:

• Computes angles, radii, and other unspecified dimensions of workpiece, using algebra, geometry, and trigonometry.
• Positions workpiece on surface plate and lays out reference points and center lines on parts.
• Measures angular dimensions, radii, contours, clearances, thread lead, and other specifications, using precision measuring instruments, such as micrometer, gauge blocks, dial indicators, height gauges, level protractors, and optical comparators.
• Tests units for fit of moving parts and mechanical functioning.
• Tests parts for hardness, using hardness testing equipment.
• Inspects, adjusts, and verifies accuracy of gauges and measuring instruments for conformance to specifications.
• Examines defective parts to determine cause of defect and recommends changes or modifications.
• Determines salvageability of defective items, utilizing knowledge of material and machining costs.
• Measures surface finish of part, using profilometer.
• Inspects first run parts and assemblies.
• Writes report regarding inspection and testing results.
• May draw enlarged part details for use on optical comparator.
• May use laser-equipped measuring instruments.
• May inspect parts for flaws or internal fissures, using ultrasonic equipment or fluorescent lights.
• May test gauges used in manufacture and assembly of watches, using measuring devices and microscope, and be designated Gauge Controller.