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2. Ruler - Wikipedia

   en.wikipedia.org/wiki/Ruler

   A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]

3. Calipers - Wikipedia

   en.wikipedia.org/wiki/Calipers

   Ordinary 150 mm (6 in) digital calipers made of stainless steel have a rated accuracy of 0.02 mm and a resolution of 0.01 mm (0.0005 in). [11] The same technology is used for longer calipers, but accuracy declines to 0.03 mm (0.001 in) for 100–200 mm (4–8 in) and 0.04 mm (0.0015 in) for 200–300 mm (8–12 in) measurements.

4. Measuring rod - Wikipedia

   en.wikipedia.org/wiki/Measuring_rod

   Excavations at Lothal dating to 2400 BCE have yielded one such ruler calibrated to about 1 ⁄ 16 inch (1.6 mm) [3] Ian Whitelaw (2007) holds that 'The Mohenjo-Daro ruler is divided into units corresponding to 1.32 inches (34 mm) and these are marked out in decimal subdivisions with remarkable accuracy—to within 0.005 inches (0.13 mm).

5. Digital read out - Wikipedia

   en.wikipedia.org/wiki/Digital_read_out

   Instead of glass, a printed circuit on a stainless steel ruler is used to trigger at least two microelectronic Hall effect sensors. Resolution is limited to 10 μm (0.0005 in) but shielding from coolant and flying chip is not a requirement. These scales are very resistant to everyday shop contaminants and debris.

6. Stainless steel - Wikipedia

   en.wikipedia.org/wiki/Stainless_steel

   Stainless steel, also known as inox, corrosion-resistant steel (CRES), and rustless steel, is an alloy of iron that is resistant to rusting and corrosion. It contains iron with chromium and other elements such as molybdenum , carbon , nickel and nitrogen depending on its specific use and cost.

7. Steel rule - Wikipedia

   en.wikipedia.org/wiki/Steel_rule

   Ruler (A Ruler Made Using Steel) This page was last edited on 6 August 2021, at 03:34 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 ...