Good used pipette (1). I will check accuracy after confirmed sale and make adjustments if needed using the gravimetric method. I have calibrated pipettes for over 20 years. I can send you a printout with each pipette tested. Also I will replace seals, o-rings or shafts if they appear to be worn. If you need it shipped quickly please let me know and will try to get it checked and shipped sooner. Pipettes may have markings or scratches from previous owners. This will not affect accuracy. Thanks