Zhongshan city valleur Technology Co. Ltd.   

Features: this series of gray card for 5 grade 9 types of international general specification. Gray gray card uses ISO, AATCC, GB chroma data, made by carefully matching. Color for each file in the data are the use of imported high-precision spectrophotometer, and color measurement China Academy of Science Transfer Standard for correction, ensure the gray data consistent with the international. Application: as the color used international standard ISO, American standard AATCC and China national standard GB the data standard to calibrate the gray card, so the use of the color fastness grade gray card evaluation, consistent with the international. This