What tool is used to measure very small distances with high precision?

• A. Ruler
• B. Micrometer
• C. Caliper
• D. Tape measure

Answer: (B)

Measuring very small distances with high precision relies on a tool that converts tiny turns of a screw into a precise linear movement. A micrometer does this with a screw gauge: turning the thimble moves the spindle toward or away from the anvil in tiny, reproducible steps. This setup yields fine resolution—typical measurements down to 0.01 mm (and in some cases 0.001 inch)—and good accuracy, making it ideal for machining tolerances and precision work. Rulers and tape measures are designed for larger, less precise measurements and have coarser markings. Calipers offer versatility and decent precision, but they don’t usually reach the smallest increments a micrometer can provide. So for very small distances with high precision, the micrometer is the best choice.