Model: SYP1013 Standard: GB/T6540, ASTM D1500 Application: To test the chroma of lubricating oil, kerosene, diesel oil and other petroleum products. Technical specifications 1)Color number: 1 --- 25 2)Standard light source: Smooth light equals to north window light 3)Environment temp.: 10 --- 35 degrees 4)Relative humidity: Less than 85%