What is one characteristic of the feeler gauge?

A feeler gauge is a tool specifically designed to measure gaps and clearances with precision. It consists of a set of thin metal blades, each of varying thickness, which can be inserted into spaces to determine the width of a gap between two surfaces. This is particularly useful in automotive and mechanical applications to ensure components, such as valve clearances or bearing clearances, are within specified tolerances.

When using a feeler gauge, the correct blade or blades that fit snugly into the gap indicate the exact measurement. This measurement is critical for maintaining optimal performance and preventing mechanical failure in engines and machinery. Therefore, this characteristic of measuring gaps makes the feeler gauge an essential instrument in various maintenance and adjustment tasks.