Panel gauges are similar in principle to marking gauges but larger, allowing wider boards and panels to be marked parallel to a prepared reference edge. Plane down to the line and you know that the edges are parallel, straight, and that the board is uniform in width.
As well as a pin, Marples panel gauges have a pencil holder on the opposite end of the stem allowing a planed down pencil to be used for a more visible mark when sawing to width.
Made at York Works in Sheffield by Joseph Marples Ltd from rosewood with solid brass wear strip and screw.