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A scriber is a hand tool
Hand tool

A hand tool is a device for performing work on a material or a physical system using only hands. The hand tools can be manually used employing mechanical force, or electrically powered, using electrical current....
 used in metalworking
Metalworking

Metalworking is the process of working with metals to create individual parts, assemblies, or large scale structures. The term covers a wide range of work from large ships, bridges and oil refineries to delicate jewellery....
 to mark lines on workpieces, prior to machining. This is used instead of pencils as the marks from pencils cannot be seen as clearly as scriber marks. They consist simply of a rod of high-carbon steel, in its hardened state, that has been sharpened to a point at one or both ends.






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Scribers
A scriber is a hand tool
Hand tool

A hand tool is a device for performing work on a material or a physical system using only hands. The hand tools can be manually used employing mechanical force, or electrically powered, using electrical current....
 used in metalworking
Metalworking

Metalworking is the process of working with metals to create individual parts, assemblies, or large scale structures. The term covers a wide range of work from large ships, bridges and oil refineries to delicate jewellery....
 to mark lines on workpieces, prior to machining. This is used instead of pencils as the marks from pencils cannot be seen as clearly as scriber marks. They consist simply of a rod of high-carbon steel, in its hardened state, that has been sharpened to a point at one or both ends. They are used by drawing the point over the surface of the workpiece to leave a shallow scratch on its surface.

Due to the nature of metal, and the accuracy generally sought after when machining it, a thick pencil or ink line would either be impossible to lay down accurately or prone to erasure during the machining operation. The crisp, bright mark exposed by the scratch of a scriber is semi-permanent and thin. The process of using the scriber is referred to as marking out
Marking out

Marking out or layout is the process of transferring a design or pattern to a workpiece, as the first step in the manufacturing process. It is performed in many industries or hobbies although in the repetition industries the machine's initial setup is designed to remove the need to mark out every individual piece....
 and may require the addition of other hand tools and equipment.

Usually a layout stain
Marking blue

Marking blue, layout stain or Prussian blue is a dye used in metalworking to aid in marking out rough parts for further machining. It is sometimes called Dykem ....
 of some form is used to increase the contrast between the scribed line and the background surface and is washed off with solvent on completion.

Scriber block

Scriberblock
A scriber block is used to layout lines at a set height from the base, thus its second name surface height gauge or just "surface gauge".

The work piece is held against an angle plate
Angle plate

An angle plate is a work holding device used as a fixture in metalworking.The angle plate is made from high quality material that has been stabilized to prevent further movement or distortion....
 so that it is perpendicular
Perpendicular

In geometry, two line or plane , are considered perpendicular to each other if they form congruence adjacent angles angles . The term may be used as a noun or adjective....
 to the surface plate
Surface plate

A surface plate is a solid, flatness plate used as the main horizontal datum references for precision inspection, marking out , and tooling setup....
, the scriber block is then adjusted to the required height and used to scribe a line parallel with the table, by sliding the block along the table's surface.

The scriber block has pins that can be pushed to protrude through the base, these can then be used as limit pins to allow the block to press against the edge of the table, controlling its movement in that plane. The upright post can be adjusted to tilt back or forward, effectively moving the scriber point up or down in a controlled fashion, coarse adjustments are made by sliding the scriber along its clamping block.

The scriber block may also be used in place of a Dial Test Indicator
Dial indicator

Dial indicators are instruments used to accurately measure a small distance. They may also be known as a dial gauge, dial test indicator , or as a "clock"....
 to detect run out (a variation in concentric
Concentric

Concentric object s share the same center , Coordinate axis or Origin with one inside the other. Circles, tubes, cylindrical shafts, Disk s, and spheres may be concentric to one another....
ity) of a workpiece mounted in a 4 jaw chuck. The scriber point acts as a visual reference against which any variation in the work piece can be judged.