Historical information

A marking gauge, also known as a scratch gauge, and] is used in woodworking and metalworking to mark out lines for cutting or other operations. The purpose of the gauge is to scribe a line parallel to a reference edge or surface. It is used in joinery and sheet metal operations.
The gauge consists of a beam, a headstock, and a scribing or marking implement, typically a pin, knife, pen or wheel. The headstock slides along the beam, and is locked in place by various means: a locking screw, cam lever, or a wedge. The marking implement is fixed to one end of the beam.

Significance

A tool that has been in use since woodworking began for hundreds if not thousands of years without much change to the design or how the tool is used. Its use to scribe a line in various material as a cutting guide and is still in use today by many trades.

Physical description

Wooden marking Gauge, small

Inscriptions & markings

None