Which of the following tools is used for checking valve clearance?

The feeler gauge is the correct tool for checking valve clearance because it is specifically designed to measure gaps and spaces with high precision. When adjusting valve clearance in an engine, it’s essential to know the exact gap between the valve stem and the rocker arm or adjusting screw. A feeler gauge consists of several thin metal blades of varying thicknesses that can be inserted into the gap. By selecting the appropriate blade that fits snugly in the gap, a technician can accurately confirm whether the clearance meets the manufacturer's specifications.

Other tools mentioned serve different purposes. A micrometer is primarily used for measuring smaller dimensions with high accuracy, typically for components like gaskets or other parts rather than gaps in valve clearance. A torque wrench is used to apply a specific torque to fasteners and is not applicable for measuring spaces. A dial indicator is often used for measuring runout or linear measurements, but it is not suited for the specific task of checking valve clearance.