What type of movements does a dial indicator measure?

A dial indicator is specifically designed to measure small movements or displacements of components, making it an essential tool in precision engineering and mechanics. This tool typically features a dial face where the movement of a pointer indicates discrepancies in alignment or movement in parts being measured.

For instance, in the context of small engine technology, a dial indicator can be used to check valve tappet clearance, crankshaft runout, or other critical alignments within the engine. The dial indicator provides a direct visual readout of tiny changes, which is vital for ensuring accuracy in assembly and operation.

The other options, though they indicate different measurements, do not align with the primary function of a dial indicator. Speed, temperature, weight, mass, volume, and pressure require different types of measuring instruments designed specifically for those purposes, such as tachometers for speed, thermometers for temperature, scales for weight, and manometers for pressure.