Fowler Probe brought our old Fadal VMC as close as possible to our new HAAS VF-4ss with Renishaw Probe. New to the Fowler brand but after 2 weeks I am happy with the purchase. The price compared to the working time has definitely paid off. Easy installation with collet holder. It is very accurate to make and ignite the ground every time. Tolerance definitely corresponds to the declared. The only thing I will say is that you absolutely must test it at full power for it to light up. Simply tapping them on the table while holding them won't work. All of this needs to be connected in order to shine a very bright red light. The car has no problems. To ensure this is as accurate as possible, make sure you blow coolant off the probe and the surface you are in contact with, as coolant will send false readings. But we love this probe. Originally bought in case our Renishaw broke but after playing with it on our old car we kept it. Couldn't ask for it to be better for use.