Mitutoyo Square Master Series 311

This device is ideal for inspecting instrument accuracy, and offers you the following benefits:

You can use it as a reference for inspecting the accuracy of high-precision measuring instruments and XY tables, such as straightness of each-axis motion and the squareness between the motions of two axes.
The squareness and straightness of the four reference surfaces and two side surfaces are finished with ultra-high accuracy.

You can use it as a reference for inspecting the accuracy of high-precision measuring instruments and XY tables, such as the straightness of each-axis motion and the squareness between the motions of two axes.
The squareness and straightness of the four reference surfaces and two side surfaces are finished with ultra-high accuracy.