Caliper: A high-accuracy instrument for measuring internal and external dimensions, such as thickness, diameter, or depth.
Micrometer: Employed for precise measurement of small object thickness or diameter.
Ruler/Tape Measure: Suitable for general length assessments.
Vernier Scale: A device offering greater precision than a standard ruler for measuring minute dimensions.
Calipers are utilized to ascertain external, internal, and depth measurements of objects, proving especially valuable in precision-critical fields like mechanical and automotive engineering.