... Long-term stable light source Main Application: 1.All kinds of coating and finishing surface,such as paint,warnishes,printing ink,ect ... . 2.Decorative materials.Such as : marble, granite, ceramic and polishing tile and so on. 3.The other kinds ... of matericals and objects,such as plastic ,woodenware and paper,etc gloss meter for testing the gloss of marble, granite, ceramic and ...