Diamond tools cannot be used on K1-K4 series machines since diamond coated tools are not able to make physical contact with the measuring plate (electrical contact)

The K4 edition and K5 machines however can be used with diamond coated tools, as it employs a haptic measuring key (touch based)

Please Note: Diamond coated tools can be identified by the dark blue retaining ring, whereas the non-diamond coated tools have the light blue retaining ring