A professional who repairs, tests, and calibrates optomechanical instruments, such as range finders, gun directors, and fire-control instruments, according to specifications, using handtools, bench machines, and precision measuring instruments. Responsibilities include:

• Disassembles optomechanical instruments and inspects for defects, such as broken or worn mechanical parts and scratched or defectively coated optical elements.
• Fabricates replacement parts, using bench lathes, drill presses, and milling machines.
• Cleans optical element, using cloth, and immerses element in solution to remove defective coating.
• Files and hones mechanical parts to facilitate meshing of gears.
• Coats optical element, using coating equipment.
• Reassembles instruments and adjusts parts to ensure freedom of movement, using handtools.
• Installs instrument in test fixture or mount, and sights known objective of fixed distance and height to test sighting accuracy of instrument.
• Adjusts readings on instrument dials to calibrate instrument according to observation.
• Measures dial graduations and scales to verify accuracy, using precision measuring instruments.
• Engraves scales and graduations on instrument dials to correct errors, using pantograph engraving machine.