Correct option is D
A
feeler gauge is a precision tool used to measure and check the clearance or gap between two mating surfaces. It consists of a set of thin, flat metal blades of varying thicknesses, each marked with its size. By inserting the blades into the gap, the user can determine the size of the clearance.
Feeler gauge also known as thickness gauge.
Advantages:
· Simple and quick to use.
· High accuracy for measuring small gaps.
Limitations:
· Suitable only for accessible gaps.
· Care required to avoid bending or damaging the blades.
