FSC Group 66: Instruments and Laboratory Equipment
- 6605: Navigational Instruments
- 6610: Flight Instruments
- 6615: Automatic Pilot Mechanisms and Airborne Gyro Components
- 6620: Engine Instruments
- 6625: Electrical and Electronic Properties Measuring and Testing Instruments
- 6630: Chemical Analysis Instruments
- 6635: Physical Properties Testing and Inspection
- 6636: Environmental Chambers and Related Equipment
- 6640: Laboratory Equipment and Supplies
- 6645: Time Measuring Instruments
- 6650: Optical Instruments, Test Equipment, Components and Accessories
- 6655: Geophysical Instruments
- 6660: Meteorological Instruments and Apparatus
- 6665: Hazard-Detecting Instruments and Apparatus
- 6670: Scales and Balances
- 6675: Drafting, Surveying, and Mapping Instruments
- 6680: Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments
- 6685: Pressure, Temperature, and Humidity Measuring and Controlling Instruments
- 6695: Combination and Miscellaneous Instruments
- 66GP: Instruments and Laboratory Equipment -- General