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2. Ruler - Wikipedia

   en.wikipedia.org/wiki/Ruler

   A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge, is an instrument used to make length measurements, whereby a user estimates a length by reading from a series of markings called "rules" along an edge of the device. [ 1] Usually, the instrument is rigid and the edge itself is a straightedge ...

3. Scale ruler - Wikipedia

   en.wikipedia.org/wiki/Scale_ruler

   Scale ruler. A scale ruler is a tool for measuring lengths and transferring measurements at a fixed ratio of length; two common examples are an architect's scale and engineer's scale. In scientific and engineering terminology, a device to measure linear distance and create proportional linear measurements is called a scale.

4. Tape measure - Wikipedia

   en.wikipedia.org/wiki/Tape_measure

   Diagram showing fractions of an inch on a standard sixteenth measuring tape. A tape measure or measuring tape is a flexible ruler used to measure length or distance . It consists of a ribbon of cloth, plastic, fibre glass, or metal strip with linear measurement markings. It is a common measuring tool.

5. 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.

6. Chi (unit) - Wikipedia

   en.wikipedia.org/wiki/Chi_(unit)

   The study of ancient rulers and other artifacts whose size in the contemporary chi was known allowed modern researchers to surmise that during the 2nd century BC to 3rd century AD the (Qin dynasty to Han dynasty to the Three Kingdoms period), the value of the chi varied between 23.1 and 24.3 cm (9.1 and 9.6 in). [3]

7. Cun (unit) - Wikipedia

   en.wikipedia.org/wiki/Cun_(unit)

   1⁄33 m. ~30.30 mm. imperial/US units. ~ 0.099 419 ft. ~ 1.1930 in. A cun ( Chinese: 寸 ts'wun ), often glossed as the Chinese inch, is a traditional Chinese unit of length. Its traditional measure is the width of a person's thumb at the knuckle, whereas the width of the two forefingers denotes 1.5 cun and the width of four fingers (except ...