This Molecular Devices Skatron MA001291AB AquaMax 1536 Microplate Dispenser Head is in unused condition and is guaranteed to be functional with a 30 day full money back return policy. This unit came from a local lab that had surplus overstocked replacement inventory after upgrading equipment. We urge customers to view all photos as they show overall condition, included accessories and useful information. Please feel free to contact us with any questions.