Metrology Glossary – U

At J.A. King, we strive to educate our team and our customers so we can all make informed decisions and improve quality. Having information at our fingertips is the best way to do that. We have compiled a list of the most common terminology within the precision measurement industry, backed by our experts with years within our industry.


Precision Measurement Glossary of Terms

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Ultrasonic Thickness Gauge

A measuring instrument for nondestructive investigation of a material’s thickness using ultrasonic waves. It is used for ultrasonic thickness measurement (UTM) of the thickness of a solid element.

Ultraviolet-A (UVA)

One of the three classifications of ultraviolet light produced by the sun as well as man-made light sources.

Ultraviolet-B (UVB)

One of the three classifications of ultraviolet light produced by the sun as well as man-made light sources.

Unbalanced Load

An AC power system using more than two wires, where the current is not equal in the current-carrying wires due to an uneven loading of the phases.

Union (Connection)

The length/diameter adjusting fitting between two nipples or between sensor/connection head and pipe nipple.

Units (of measure)

A determinate quantity (as of length, time, heat, or value) adopted as a standard of measurement. The SI is made up of 7 base units that define the 22 derived units with special names and symbols.

Universal Length Machine

A precision measuring device for external and internal measurements with a measuring range of up to 120mm.

Universal Serial Bus (USB)

A type of interface that allows communication between a host controller and other devices


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