Check the listing for details. MAS Technologies 500 Oxygen Diffusion System Plastic Sheet Bag Tester / Computer. Condition: Used. Listed at 400.00 USD. MAS Technologies 500 Oxygen Diffusion System Plastic Sheet / Bag Tester This was used in a bag testing area of a University's Blow Molding / Sheet Making section of the lab. It supposedly tested the thin plastic material for how fast oxygen would go through the test sheet. I don't know much about it, but it comes with a computer that was used (as shown). It will ship via Fed Ex Ground. Check out my other listings for a MAS Technologies 1000 Moisture Diffusion System Free Shipping In Continental US. Local Pickup Available Please contact us with any questions or any other industrial equipment needs. We offer a variety of used material handling and plastics processing equipment. Check out our other listings for: Hytrol Conveyor Knapp Conveyor Belt Conveyor Flat Conveyor Curves Gravity Conveyors Other Material Handling & Plastics Processing Equipment Thank You For Looking!