The function of the tool setting instrument The measurement and compensation of the tool offset value in five directions can effectively the error and inefficiency caused by manual tool setting. No matter what kind of cutting tool is used for workpiece contour turning or milling, all tool tip points or tool lines involved in cutting must be adjusted or compensated so that they are accurately located at the same theoretical point or of the workpiece coordinate system on-line How to use: 1.Alligator clip is fixed on the cutter 2. port has been connected to the control board (A5 interface on the 3018pro control board) 3.Place (plastic + aluminum plate) under the tool [GRBL Z-probe]CNC Router Tool Setting Automatic Tool Setter. Thickness: 1.6mm (±0.03mm) [Tool Setting Function] It can accurately locate the working , and is most suitable for PCB engraving. [Easy to Use]You can refer to our video to understand how to use it correctly. [Probe ]Please change the Probe in Grbl to: G91G21G38.2Z-30F100;G92Z1.6;G0Z5F10 Material: PC+Metal colour: As shown Package Contents: 1 x Clamp 1 x Wire 1 x Probe board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.