The thickness gauge measures thickness and clearance of two points to the nearest what?

• A. Center punch.
• B. Thickness gauge.
• C. Pressure gauge.
• D. Mechanical fingers.

Answer: (B)

Measuring exact spacing between two surfaces or the thickness of a material requires a device designed for precise dimension reading. A thickness gauge is built to determine that distance directly, giving a measurement of thickness or clearance with very fine resolution. In practice, it provides readings down to small increments—often to about 0.001 inch (one thousandth of an inch) or the equivalent in metric units—so you can know exactly how far apart two points are. The other tools shown aren’t used for this purpose: a center punch marks a surface, a pressure gauge measures pressure, and mechanical fingers gauge gaps in different ways but aren’t the standard instrument for precise thickness or two-point clearance. So the thickness gauge is the correct choice because it is the instrument specifically for measuring thickness and clearance with that level of precision.