PMP volumetrics flasks. Tolerances class A according to DIN EN ISO 1042, highly transparent, with ring mark individually calibrated to `In ´ and standard NS stopper made of PP. With imprinted lot number and certificate. Exposure to temperatures up to 121ºC (autoclaving) will not cause permanent exceeding of tolerance limits. Cleaning up to max. 60ºC is recommended to preserve marks and inscriptions.rAlso available with DAkkS calibration certificate or individual quality certificate.