What tool is designed to measure distance while tracing a pattern?

The planimeter is specifically designed for measuring the area of a two-dimensional shape, but it can also measure distance while tracing the perimeter of a pattern. This tool works by following the outline of the shape, allowing surveyors and engineers to obtain accurate measurements. Utilizing a planimeter involves moving a tracing arm around the perimeter, which provides precise information about the distance as it counts the increments based on the movement of the arm.

Other tools listed, such as laser measurers and measuring tapes, are typically used for straight-line measurements, making them less suitable for following intricate patterns. A surveying compass, on the other hand, is used primarily for determining directions and angles rather than for measuring distances while tracing. The unique mechanical design of the planimeter makes it advantageous for tasks that require tracing along curved or irregular paths where other measuring tools would not yield the same level of accuracy.