The Mitutoyo 572-474 Absolute Digimatic Horizontal Scale Unit features an Origin key that allows setting of an absolute zero point to be used as reference in subsequent measurements. Once set, the ABS Digimatic Scale Unit is ready to show its true position whenever turned on rather than 0.00" as with standard models. The Zero/ABS key allows the display to be zero-set at any slider position along the beam for incremental comparison measurements. This key will also return to the absolute coordinate with a display of the true position from the origin point. Does not contain a rack, pinion or glass scale. The digimatic scale is safely embedded in the hardened stainless steel blade. All units come with two mounting brackets, each are located at either end of the scale. Includes SPC data output. This is a horizontal scale with a measuring range of 0-18" / 0-450mm.