This document provides information on gloss meters for measuring the luster of surfaces at angles of 20, 60, and 85 degrees. It lists the specifications of two gloss meter models, including their measuring range, accuracy, power source, operating temperature and humidity conditions, and dimensions. The gloss meters are designed to measure the luster of materials like printing inks, paints, coatings, plastics, and other non-metallic surfaces according to Chinese and international standards.