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The RCA SK3719 is a type of pin-in-disc tribometer. It is used for tribological characterization and wear testing of commercial and aerospace materials such as metals, ceramics, composites, and coatings. It can perform various tests that measure friction, wear, and other tribological properties. The instrument includes an automated rotational head which houses the pin-in-disc configuration. The stationary disc is held up against a rotating pin. The disc is made up of the sample material, while the pin is typically a specific material like stainless steel. As the pin wears away at the sample disc, the levels of friction, wear, and other tribological properties can be measured. The SK3719 also includes a computer-controlled software package which takes all of the data readings.