Large Sample Capacity and Wide Range of Sample Vessels. HT4000L can handle up to 176 2ml-vials per run or it can work with different kinds of sample vessels. Inject samples out of vials (2/4/6/10/20/40 ml), test tubes, tube blocks or plates including Vacutainer®, Eppendorf® tubes, and Well Format Tubes. Choose from standard racks or enquire for a custom design: custom racks pay for