Metrol super-high precision switches have an incredible 0.5 micron accuracy. The "tool setter" variants are often used to detect/adjust for tool wear in machine tool applications. With no temperature drift and a service life of 3 million cycles, these aluminum or stainless-steel housed switches are dustproof /waterproof (IP67).
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Would you buy this item again? Yes
I am using this device for a tool touch off probe, connected to a Centroid Acorn system. I was easy to connect and provides a level of accuracy required for machining. I made a base to attach it to, as the device is not very big and the base offers some protection and a little extra height.