This U.S. Census Bureau NAICS-based industry comprises establishments primarily engaged in manufacturing instruments for measuring and testing the characteristics of electricity and electrical signals.

Cross-References. Establishments primarily engaged in--

• Manufacturing electronic checkout, monitoring, evaluating, and other electronic support equipment for electronic navigational, radar, and sonar systems--are classified in U.S. Census Bureau NAICS-based industry 3391111, Laboratory Equipment Manufacturing, except Distilling, Heating, Cooling, Weighing, Centrifuges and Furniture.