Gauge

Gauge may refer to:

Measurements

"Gauge" vs. "Gage": Generally speaking, a "gauge" is measuring device that has a needle or other indicator, a "gage" does not, e.g. pin gages, feeler gages, check fixtures, etc.

American wire gauge, a measurement of diameter of a wire
Gauge (bore diameter), the caliber of a gun barrel
Stubs Iron Wire Gauge, which corresponds to the diameter of a hypodermic needle

See also Category:Wire gauges

Gauge (sheet metal), thickness of metal in sheet form - varies by composition
Gauge (engineering), any of a variety of measurement devices.
Sight glass for measuring liquid level heights in storage tanks and pressure vessels
Gauge blocks, precision measuring standards (Johansson or slip gauges)
Boost gauge, a gauge used in conjunction with turbo- super-chargers
Pressure gauge or vacuum gauge, see pressure measurement
Gauge (mathematics), a semi norm, a concept related to convex sets
Stream gauge for measuring height and discharge of a river or stream
The size of a stretched piercing, see stretching (body piercing)
Film gauge, a physical property of film stock which defines its size

Physics

For the use of the concept of gauge in physics, see Gauge theory, Gauge fixing.

Railroads

Rail gauge, the distance between the two rails forming a railroad track
Standard gauge
narrow gauge
Broad gauge
Loading gauge - maximum width and height of engines and loaded wagons, etc.
Structure gauge - minimum size of bridges, tunnels, platforms, etc.
axle load - maximum weight of axles for a given track.
break of gauge

Other

Gauge (knitting), the number of stitches in a given length
Change of gauge, when an aircraft type is scheduled to change at a stopping point of a direct flight
Gauge (porn star), the stage name of a pornographic film star
For the Canadian country music group 12 Gauge, see Emerson Drive.