6630-99-220-4544

Color Standards Disk

6630992204544 992204544 NCB 63C980

A series of transparent glass color standards mounted in a disk or turret and identified by numerical markings. The standards may indicate hydrogen ion concentration (pH values), residual chlorine concentration, certain toxic substances, and other solutions. Similarly, the standards may be used in the grading of petroleum products as prescribed in various test methods. View more Color Standards Disk