These PYREX Single Metric Scale Cylinders- Class A, TC with Standard Taper Stopcock are calibrated "To Contain" in accordance with ASTM E-1272 and ASTM E-542. Each features the PYREX stopper and have durable white enamel graduations. Serialized/Certified models are tested and calibrated in an ISO/IEC 17025 laboratory, are individually serialized, and supplied with a Certificate of Identification and Capacity, traceable to NIST standards. Key Features Calibrated "To Contain"...