Which tool is used for dimensional inspection?

• A. Ultrasonic
• B. Micrometers, T-gauges, feeler gauges, go/no-go gauges, and dial indicators
• C. X-ray
• D. Visual inspection

Answer: (B)

Dimensional inspection relies on instruments that quantify sizes, gaps, and tolerances rather than just assess appearance. The best option brings together a range of precise measuring tools: micrometers for accurate outside dimensions, T-gauges for specific dimensional checks, feeler gauges for clearances, go/no-go gauges to quickly verify whether a feature stays within tolerance, and dial indicators to measure runout, alignment, or small displacements. This combination provides actual measurements or clear pass/fail decisions, which is what dimensional inspection is all about.

Ultrasonic testing is mainly for detecting internal flaws and measuring thickness in some contexts, not for general size verification. X-ray reveals internal geometries but isn’t a standard dimensional inspection tool. Visual inspection assesses appearance and surface defects but doesn’t provide precise measurements.