How do you use the mortise gauge?

A mortise gauge is used to mark out precise measurements on wood, particularly for creating mortises and tenons. To use it, set the gauge's sliding arm to the desired width of the mortise or tenon. Place the gauge's pin against the edge of the wood and slide it along to mark a line, ensuring consistent width. For accurate depth, adjust the other arm to the required measurement and repeat the marking process on the opposite side.