used  working variable volume  Rainin   pipet-plus set (3 pipets, accept LTS tips) .  The pipets are: RL200(20-200ul), RL20 (2-20ul) and RL2 (0.2-2ul)  .The pipettor sold have been used only with non-radioactive and non-biohazardous materials. Also, all pipettors have been tested to work properly- I have measured the aliquottes on a Mettler scale. Some pipets available separately- please inquire.  If you are not satisfied, you can return the product within 30 days for a full refund excluding shipping expenses. Lot con6/5bluebx