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2. Graduation (scale) - Wikipedia

   en.wikipedia.org/wiki/Graduation_(scale)

   A ruler with two linear scales: the metric and imperial.It includes shorter minor graduations and longer major graduations. A graduation is a marking used to indicate points on a visual scale, which can be present on a container, a measuring device, or the axes of a line plot, usually one of many along a line or curve, each in the form of short line segments perpendicular to the line or curve.

3. Tape measure - Wikipedia

   en.wikipedia.org/wiki/Tape_measure

   Some tapes have additional marks in the shape of small black diamonds, appearing every 19.2 inches (488 mm), used to mark out equal spacing for joists (five joists or trusses per US standard 8-foot (2,438 mm) length of building material). Many US tapes also have special markings every 16 inches (406 mm), which is a US standard interval for ...

4. Thousandth of an inch - Wikipedia

   en.wikipedia.org/wiki/Thousandth_of_an_inch

   A thousandth of an inch is a derived unit of length in a system of units using inches.Equal to 1 ⁄ 1000 of an inch, a thousandth is commonly called a thou / ˈ θ aʊ / (used for both singular and plural) or, particularly in North America, a mil (plural mils).

5. Scale ruler - Wikipedia

   en.wikipedia.org/wiki/Scale_ruler

   A scale ruler is a tool for measuring lengths and ... A 1:5 architectural scale (inches to feet) would be a 1:60 unitless scale (inches to inches) since there are 60 ...

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. 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 rimfire firearms ...

7. Slide rule - Wikipedia

   en.wikipedia.org/wiki/Slide_rule

   Simple slide rule made from index cards marked with powers of 2, calculating 8x4 by aligning the bottom ruler to start where the top ruler is 8, and then reading at the number above where the bottom ruler is 4.