This Feeler guage is used to check clearnce between Impeller and housing. Comes with 26 straight blades.

A feeler gauge is a precision tool that is used to measure the clearance between two surfaces or components. It is a thin strip of metal with a handle on one end and a series of blades of different thicknesses on the other end. The blades are typically marked with their corresponding thicknesses in thousandths of an inch or millimeters.

Feeler gauges are often used in automotive and mechanical applications to measure the clearance between parts, such as spark plug gaps, valve clearances, and bearing tolerances. They are also commonly used in manufacturing and other settings where precise measurements are necessary.

To use a feeler gauge, the user selects a blade that is slightly smaller than the desired clearance and inserts it between the two surfaces. The blade should be able to move freely between the surfaces without binding or dragging. If the blade is too thick to fit, a thinner blade is selected, and the process is repeated until the appropriate blade is found. The thickness of the blade that fits freely between the surfaces is the measurement of the clearance.

Feeler gauges are a useful tool for anyone who needs to measure small gaps or clearances with precision. They are typically inexpensive and easy to use, and they are a common tool in many automotive and mechanical tool kits.