This Amherst Process Instruments Aero Particle System is in great condition and was removed from a working environment. This unit came from a local lab that had surplus equipment and was in use prior to removal. We urge customers to view all photos as they show overall condition, included accessories and useful information. Please Note: Listing only includes what is shown in photos and does not include any additional accessories or software required for operation. Although we do not have the means for full testing, we are offering a 30 day full money back guarantee return policy on this system. Buyer handling return shipping. We will be happy to provide additional information as well as photos so please feel free to contact us with any questions. Listing Includes: Aero-Dryer 8020 Aero-Breather 0-8026 with API 800013-1 PCB Aero-Sizer LD / Aero-Dispenser 8050 Vacuum Pump 8041