Proficiency using precision tools and instrumentation such as calipers, micrometers, height gauges, optical inspection systems, ultrasonic cleaners, welders, mass spectrometers, helium leak detectors, and digital multimeters. Use precision measurement, inspection, assembly, and test equipment including calipers, micrometers, height gauges, optical cameras, ultrasonic cleaners, welders, mass spectrometers, and digital multimeters.