Compatible with Genmitsu CNC milling / engraving machine 3018-PROVer V2, 3020 PRO MAX V2, 4040-PRO and 4040 Reno ➢With just one mouse click, CNC milling/engraving machines automatically return to a predefined starting position, so you can easily change and adjust your machining tools. ➢ This is a photoelectric Z button that works much more accurately. The two built-in indicators save you time when setting up. The blue indicator lights up once the Z axis measuring probe has been connected to the control assembly, and the red indicator lights up when the CNC bits touch the Z button. This makes adjusting the tool height a breeze, no more paper. Easy to check the setting., Manufacturer: Sainsmart