Flatness Measuring Tool

This tool with a dial indicator will allow you to measure how flat a surface is and if it is up or down. This design has a 250 mm span (About 10".) Calibrate it on a know flat surface. Granite counter top is ideal. I used it to flatten the bed of my printer CR10.

The bore for the dial indicator is .375" this is common to the analog and digital dial indicator that I have. There is a provision for an M3 screw and nut to secure the dial indicator (it may be tight enough without the screw.)