This U.S. industry comprises establishments primarily engaged in manufacturing instruments and related devices for measuring, displaying, indicating, recording, transmitting, and controlling industrial process variables. These instruments measure, display or control (monitor, analyze, and so forth) industrial process variables, such as temperature, humidity, pressure, vacuum, combustion, flow, level, viscosity, density, acidity, concentration, and rotation. Manufacturing instruments for measuring or testing of electricity and electrical signals--are classified in U.S. Industry 334515, Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals; Manufacturing medical thermometers--are classified in U.S. Industry 339112, Surgical and Medical Instrument Manufacturing; Manufacturing glass hydrometers and thermometers for other nonmedical uses--are classified in U.S. Industry 334519, Other Measuring and Controlling Device Manufacturing; Manufacturing instruments and instrumentation systems for laboratory analysis of samples--are classified in U.S. Industry 334516, Analytical Laboratory Instrument Manufacturing; and Manufacturing optical alignment and display instruments, optical comparators, and optical test and inspection equipment--are classified in U.S. Industry 333314, Optical Instrument and Lens Manufacturing.
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