The standard BS ISO TAPPI Act 8254-3-2016 20 ° gloss of light in poly beam of light for measurement of paper and Cardboard gloss specifies the use of poly beam of light Glossiness Meter for the measurement of paper and Cardboard gloss at 20 ° incident angle according to the TAPPI method. gloss is the ability of paper and Cardboard surfaces to reflect light, which directly affects their visual effect and printing quality. The standard details the use of instruments, preparation of samples, measurement procedures, and environmental conditions to ensure the accuracy and conformity of gloss measurements. This method is widely used in the quality control of paper products and the detection of gloss in the production process, especially in the printing industry.