ASTM D2805-2011 (2018) Standard Test Method for Measuring Paints Hiding Power with Reflectometers specifies a standard test method for measuring paints hiding power using reflectometers. This method assesses the hiding power of paints by measuring the intensity of light reflected by the coating surface. The standard requires quantitative analysis of the hiding power of films using a reflection meter device under specific test conditions, which is suitable for quality control and development of various paints and coatings. This method provides a simple and accurate evaluation method to help ensure that paints products meet hiding power requirements and improve the coverage and visual mass of coatings.