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2. Mechanical pencil - Wikipedia

   en.wikipedia.org/wiki/Mechanical_pencil

   As with non-mechanical pencils, the leads of mechanical pencils are available in a range of hardness ratings, depending on the user's desired balance between darkness and durability. A commonly-used mechanical pencil lead is identical in density, but not in thickness to a traditional HB (US#2) pencil lead.

3. Pencil - Wikipedia

   en.wikipedia.org/wiki/Pencil

   Lead for mechanical pencils Flexible pencils. Mechanical pencils use mechanical methods to push lead through a hole at the end. These can be divided into two groups: with propelling pencils an internal mechanism is employed to push the lead out from an internal compartment, while clutch pencils merely hold the lead in place (the lead is ...

4. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   175–200 μm – typical thickness of a solar cell. 200 μm – typical length of Paramecium caudatum, a ciliate protist; 200 μm – nominal width of the smallest commonly available mechanical pencil lead (0.2 mm) 250–300 μm – length of a dust mite [107] 340 μm – length of a pixel on a 17-inch monitor with a resolution of 1024×768

5. Technical drawing tool - Wikipedia

   en.wikipedia.org/wiki/Technical_drawing_tool

   Traditional and typical styli used for technical drawing are pencils and technical pens. Video of a 1930s dotted-line drawing pen. Pencils in use are usually mechanical pencils with a standard lead thickness. The usual line widths are 0.35 mm, 0.5 mm, 0.7 mm and 1.0 mm. Hardness varies usually from HB to 2H.

6. Technical pen - Wikipedia

   en.wikipedia.org/wiki/Technical_pen

   Text (produced by an ISO stencil template for use with the technical pens) of 5 mm in height has a stroke or line thickness of 0.5 mm, and so requires a brown-nibbed 0.5 mm pen. If this text were used in an ISO-sized document (e.g. A0), and the document were reproduced at half its original height (A2), the text would be rendered 2.5 mm high ...

7. Fact check: Pencils are normally used to vote as ink can ...

   www.aol.com/fact-check-pencils-normally-used...

   Pencils are commonly used at polling stations instead of pens. This is because ink might run on to different sections of the ballot and obscure the voter’s choice. The Facts.