CNC Shop - Knife Calibrator Retrofit KitThe knife calibrator is a laser based, non contact sensor used for alignment correction and tool length detection of knife blades. The sensor is installed on the machines tabletop and is fitted with a sensor cover to protect the emitter and receiver from debris. The sensor operates in a similar fashion to the photoelectric beam seen in most garage door systems. >The sensor determines the angle and length of knife blade tools, eliminating the need for