This Kipp & Zonen BD41 2-Channel Chart Recorder 901 235413/901-66 came from a local lab that had surplus equipment. When powered on, one of the recorder pens moves all the way to the left and the motor continues to spin. We are unsure of the issue. As a result, recorder is being sold as-is. 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.