Which type of calipers contains a straight measuring rule?

The type of calipers that contains a straight measuring rule is the slide caliper. Slide calipers are designed with two arms that slide along a straight scale, allowing for measurements to be taken with precision. The straight measuring rule, usually marked with graduated measurements, is integral to this design as it provides a reference for determining the distance between the two arms when they are closed or open.

In applications where high accuracy is required, slide calipers are particularly useful because they can measure internal and external dimensions as well as depths. The simplicity of their construction, featuring a ruler and a movable jaw, makes them a reliable choice for technicians working with gas turbine systems. Unlike dial and digital calipers, which utilize a dial or a digital readout for measurement, slide calipers rely on the physical measurement against a straight rule, making them versatile for various gauging tasks.