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A like rare used set of 5 Rainin Pipet variable volumes pipets with tip ejectors, accepts universal tips, models R1000 (100--1000ul) , R 200 (20-300ul) ,R 20 (5-20 ul) , R10 (1-10 ul) , R2 (0.2-2 ul) . The pipettors 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. . If you are not satisfied, you can return the product within 5 days for a full refund excluding shipping expenses.