Here is a short video of the plate in action. All you need is to attach the probe form your controller and either probe manually each axis or use a macro in your G-code sender.
Sample macro that works in bCNC:
G38.2 Z-10 F100; probe 10mm down 100 mm/min
G92 Z2.91; set Z0 - the probe thickness (offset)
G91 G0 Z6; move Z Up
G91 G0 X-30; move X left
G91 G0 Z-6; move Z down
G38.2 X10 F100; probe X 10mm right at 100 mm/min
G92 X-11.7; set X0 (touch plate side thickness + half the tool diameter, in this case the tool is 3.175mm )
G91 G0 X-3; move away in X
G91 G0 Z6; move Z 6mm up
G91 G0 Y-30; move Y
G91 G0 X30; move X
G91 G0 Z-6; move Z
G38.2 Y10 F100; probe Y
G92 Y-11.7; set Y0 +offset as in X
G91 G0 Y-3; move away from plate
G91 G0 Z10; move Z above enogh to remobe plate
G90 G0 X0Y0; move X and Y to work zero, after that just remove plate and move to Z to work zero and you are done

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