Production of marble testing box

Marble testing box production is an equipment used for inspecting or marking arbitrary angle lines of precision workpieces, mainly used for checking and marking the parallelism and perpendicularity of components. According to the different materials, square boxes can be divided into cast iron square boxes and marble square boxes. Cast iron square boxes are usually made of gray cast iron, with a dimensional accuracy within 0.01 millimeters. Adjacent planes are perpendicular to each other, and the allowable error is within 0.01 millimeters. ?