15 and 50 ml graduated conical tubes in high-transparency PP with large whitemarking area. Withstands temperature extremes of -80°C to +121°C. Includes blue thread-design plug-seal cap with ribbed edge for safe and easy opening and closing. Conical bottom for total sample recovery. Easy-to-read graduations are pre- printed as follows: 15 ml tubes are graduated in 0.5 ml subdivisions from 2 to 15 ml 50 ml tubes are graduated in 2.5 ml subdivisions from 5 to 50 ml. Sterile tubes are irradiated by ionizing beta radiation. Designed for sample collection or transportation. Sterile versions are pyrogen-free, endotoxines/free, autoclavable and carry the CE conformity mark.