The standard BS EN ISO 13803-2014 Determination of the Gloss of Paint Films at 20 ° for Paints and Varnishes specifies the method of measuring the gloss of paint and varnishes at 20 ° incidence angle using a gloss meter. Gloss is an important indicator of the ability of the surface of a coating film to reflect light and directly affects the visual effect and quality of the coating film. The standard details the calibration of the instrument, the test procedure, the environmental conditions and how to handle the coating sample to ensure the accuracy and repeatability of the measurement results. Suitable for all types of paint and varnish products, it is widely used in the field of paint production, quality control and product inspection.