Viscosity standard^ Viscosity standard, Zahn, Shell, and Ford Cups, used for calibration and verification procedures for all types of viscometers, including glass capillary viscometers, rotational 1 L This listing is for Each Viscosity standard^ Viscosity standard, Zahn, Shell, and Ford Cups, used for calibration and verification procedures for all types of viscometers, including glass capillary viscometers, rotational viscometers, falling ball viscometers, cup viscometers, and others. 1 L This listing is for Each