The Gauge consists of four components : main scale , height gauge , undercut depth gauge and multiple-purpose gauge and is specially used for the measurement of the bevel angle , height , width , gap and undercut depth of weldment .It is suitable for manufacturing boilers, bridges, chemical machinery, and ships and for inspecting the welding quality of pressure vessels. This product is made of stainless steel, with reasonable structure and beautiful appearance, which is easy to use.