This Barnstead Thermolyne Sybron 41900 Incubator I41925 is in used condition, has been tested and is guaranteed to be fully functional. This unit came from a local lab that had surplus equipment. Incubator shows some aesthetic signs of use. We urge customers to view all photos as they show overall condition, included accessories and functionality. The only minor issue worth noting is the interior glass door appears to be missing a handle/lock mechanism. We will attempt to replace prior to shipping. We will be happy to provide additional information as well as photos so please feel free to contact us with any questions. For additional information please copy and paste link to manual below: https://archive-resources.coleparmer.com/Manual_pdfs/LT700X1%20GenPurp%2041900%2042000.pdf If link is no longer available, please contact us for copy of PDF