The CIE 176-2006 standard defines the geometric tolerance requirements to be followed in Color measurement, aiming to ensure the conformity and reliability of measurement results under different equipment and environment conditions. The standard describes the geometric configuration of measuring instruments in detail, including specifications for parameters such as observation angle, light source direction and reception angle, to ensure that comparable Color data can be obtained in different measurement environments. By setting reasonable geometric tolerances, CIE 176-2006 provides a unified measurement method for Color scientific research and application, reducing errors caused by factors such as Geometry, and is widely used in Optical inspection, printing, Coating and other industries.