Updates white and black calibration points, Spot Size at Sample: 3.4mm, Spectral Range: 400nm to 700nm, Power supply, Measurement Range: 0.00D to 2.50D, Manually enter reflectance values for white calibration, Light Source: Gas pressure @ 2856 deg. K, Density Options: Status Precision Gray Set, Color Options: LAB Method LCh Method CMC Tolerancing CIE94 Tolerancing