Automotive tolerances are often measured in fractions of a millimeter, and guessing will lead to component failure. A digital caliper provides fast, readable measurements down to 0.01mm or 0.0005 inches. It features adjustable jaws for measuring outside diameters (like rotor thickness), inside diameters (like cylinder bores), and a depth rod for measuring recess depth. Keep the slider clean and dry, and always verify that the tool reads zero when the jaws are closed before taking a measurement.
Mechanic Glossary
Digital Caliper
A precision measuring instrument used to take accurate dimensions of parts, including thickness, depth, and diameter.
Frequently Asked Questions
Clean the jaws, close them completely, and press the zero button. You can test the accuracy against a known calibration block or a brand-new drill bit of a known size.
This is a classic sign of a low battery. Replace the small button-cell battery, and the screen should stabilize.
While calipers are great for quick checks, they are not precise enough for cylinder bores. You should use a dial bore gauge and a micrometer for engine block tolerances.