The ISO 8254-2:2016 standard specifies a method for measuring paper and Cardboard specular gloss using a 75 ° parallel beam of light, using a photometric test method to evaluate visual Gloss by reflection. This method is suitable for flat paper and Cardboard with Glossiness below 65, especially for materials with low to medium Glossiness. This standard provides a uniform test procedure for paper and Cardboard gloss measurement, which is widely used in quality control, product development and international trade to help evaluate the surface properties and printability of paper.