This Thermolyne Nuova Magnetic Stirrer Model S18525 has been tested and is guaranteed to be fully functional. This item came from a local lab that had surplus inventory. Stirrers show some aesthetic signs of use/age. We urge customers to view all photos as they show overall condition, included accessories and functionality. Please note that at time of listing we have two units available. Photos 6-10 show second unit. Please feel free to contact us with any questions.