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Nalgene* Polymethylpentene Volumetric Flasks
With polypropylene screw closures. Gravimetrically calibrated individually to contain/to deliver at 20°C. Printing is durable and will not wear off. Guaranteed to the Class B accuracy requirements of ASTM E288 and ISO Standard 384. No meniscus to confuse readings. Window-clear. Autoclavable, graduated, leakproof.