These BRAND® graduated cylinders comply with the Class A error limits required by the US Pharmacopeia. Each graduated cylinder is calibrated on computer controlled, automated production lines for maximum precision. Full ring marks at major graduations make it easy to read. Features a spout and hexagonal glass base. BLAUBRAND® blue enamel markings are highly legibile, and abrasion resistant. All graduated cylinders come with a batch number and an accompanying batch certificate.