1. Are located exactly on the same theoretical or same axis of the workpiece coordinate system online. Use: 1. Crocodile clip is attached to the knife. 2. Port has been connected to the control board (A5 interface of the 3018pro control board) 2. The function of the tool adjuster: the measurement and compensation of the tool offset value in five directions can effectively eliminate the errors and inefficiencies caused by manual tool adjustment. Regardless of what type of cutting tool is used to turn or mill the workpiece contour, all tool point points or tool axis lines involved in cutting must be adjusted or compensated for 3. Place (plastic aluminium plate) under the tool. Material: plastic. Color as shown 4. GRBL Z Probe CNC Router Tool Setting Automatic Tool Adjuster. Thickness: 1.6 mm (±0.03 mm). Tool adjustment function. It can accurately locate the work surface and is suitable for PCB engraving.