Lab Ref™ is designed to allow colorimeter, spectrophotometer, and hybrid color measurement device users to verify that their equipment can measure colors accurately in terms of CIE specified values. Subtle differences in the design, calibration, and operation of this equipment can lead to different units yielding different colorimetric values, even when measuring the same sample. In turn, the difference in these values can create uncertainty about the accuracy of any one unit as well as confusion in the communication of CIE data.