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2. Calipers - Wikipedia

   en.wikipedia.org/wiki/Calipers

   Two inside calipers. Inside calipers are used to measure the internal size of an object. The upper caliper in the image (on the right) requires manual adjustment prior to fitting. Fine setting of this caliper type is performed by tapping the caliper legs lightly on a handy surface until they will almost pass over the object.

3. Bore gauge - Wikipedia

   en.wikipedia.org/wiki/Bore_gauge

   That is the diameter of the component. Repeat the procedure in 3 different places and get the average value of the diameter of the component. This is the most common way to measure the larger bore. It is available in different ranges; normally you can use this from 300 mm to 4000 mm for external diameter.

4. Gauge (instrument) - Wikipedia

   en.wikipedia.org/wiki/Gauge_(instrument)

   a device used for measuring holes. Hole gauge [3] used to gage internal dimensions of bores that are either too small in diameter for an inside micrometer, and have greater economy than a bore gage or other precision internal gage. Caliper: a device used to measure the distance between two opposing sides of an object. Center gauges and fishtail ...

5. Pigging - Wikipedia

   en.wikipedia.org/wiki/Pigging

   Intelligent pigs may also use calipers to measure the inside geometry of the pipeline. In 1961, the first intelligent pig was run by Shell Development. It demonstrated that a self-contained electronic instrument could traverse a pipeline while measuring and recording wall thickness. The instrument used electromagnetic fields to sense wall ...

6. Caliber - Wikipedia

   en.wikipedia.org/wiki/Caliber

   While modern firearms are generally referred to by the name of the cartridge the gun is chambered for, they are still categorized together based on bore diameter. [citation needed] For example, a firearm might be described as a "30 caliber rifle", which could accommodate any of a wide range of cartridges using a roughly 0.30 inches (7.6 mm) projectile; or as a "22 rimfire", referring to any ...

7. Feret diameter - Wikipedia

   en.wikipedia.org/wiki/Feret_diameter

   The diameter of an object measured with a caliper is sometimes called the caliper diameter; it is the same as Feret diameter. Feret diameter applied to a projection of a 3D object. The Feret diameter or Feret's diameter is a measure of an object's size along a specified direction. In general, it can be defined as the distance between the two ...