The clearance between the piston rings and the ring lands is measured with a?

The clearance between the piston rings and the ring lands is typically measured with a thickness gauge. This tool is specifically designed to measure the gap or clearance in tight spaces where precision is essential. The thickness gauge can help determine whether the clearance is within acceptable limits, ensuring proper function and performance of the piston in its cylinder.

In this context, a thickness gauge provides the right combination of thinness and rigidity needed to accurately assess the space between the piston rings and the ring lands, which are crucial for maintaining the efficiency of the engine and minimizing wear.

The other options, while useful in measurement tasks, are not ideal for this specific application. A caliper, while versatile for measuring dimensions, may not provide the needed precision for such clearances. A micrometer is often used for measuring very small distances but may not be as appropriate for assessing the clearance in this instance. A feeler gauge could be relevant in some contexts; however, its design is generally more suited for measuring gaps rather than direct clearance measurements between mechanical components like piston rings and lands.