.Meet ASTM E288 Specification – Sizes 5mL to 2000mLMeet ASTM E237 Specification– Sizes 1mL and 2mLCalibrated TC – “To Contain”Class B calibration tolerance for general laboratory workSupplied with glass pennyhead stoppersDiamond etched graduation marksHigh resistance to chemicalsDurable white enamel printing Wide mouth options are available for easier filling and mixing.