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Length, when referring to measurement in one dimension (as in the length of a line segment or a or a piece of string), has a specialized meaning. So does height when it is used in conjunction with base.
NON-CONTACT HEIGHT MEASUREMENT. Height, like thickness, can be either measured with two sensors, one above and one below the object. Second possibility is measurement using a reference plane. As there often is a conveyor under the object to be measured, height measurements typically work with one sensor only.