This is the Artesania Centering Ruler Modelling Tool [27326].

The Micro Centering Ruler, belonging to the Micro Tools Collection, is an ally on any modeling and crafts project. Made of high quality stainless steel, designed by and for modelers, the ruler is very useful for building your models. The Micro Centering Ruler allows you to find the center of the parts with precision for a more effective assembly. With metric and imperial measurement system.

A normal ruler has 0 at one end, the Micro Centering Ruler places 0 on the center and the numbering grows on both sides. It includes measurements in metric systems, on one side, and imperial, on the other.

When a modeler or crafts fan needs to find the center of a part, she/he must place the centering ruler so that the measurement coincides on the edges, and the 0 of the ruler marks the center of the part. In this sense, the small points on the ruler allow measurements to be marked with total accuracy, marking through these with a mechanical pencil or pencil. Includes a protractor within the ruler itself.

This tool for modeling and crafts has two holes to hang it. Total length of the ruler, 7.87'' (20cms), 3.93'' (10cms) on each side.