How do you use a butt gauge?

A butt gauge, often referred to as a buttock gauge or similar tools in construction and woodworking, is used to measure the curvature or dimensions of a person's or object's rear profile to ensure proper fit or ergonomic design. To use it, position the gauge against the area you want to measure, ensuring it is level and aligned with the contours. Read the measurement from the scale or indicators on the gauge. Always ensure the gauge is clean and properly calibrated for accurate results.