Gauge Length Estimator bt30 and bt40

a tool for quickly getting a rough gauge length of a tool before using auto tool length measurement.

I marked the scale with a fiber laser but there are many other options if you have a mill you could engrave the profile or print a paper scale and stick it on 

I used a laser cutter to cut some parts and milled others but they could all be printed.

The scale on the profile can be slid up and down to calibrate it with your master tool. 

requires 2x m5 x 16 socket head cap screws and 2 t-nuts to suit the alu profile