This Lab-Line Model 3540 Shaking Water Bath is in used condition, has been tested and is guaranteed to be fully functional. This item came from a local lab that had surplus equipment. Bath shows some signs of use. We urge customers to view all photos as they show overall condition, included accessories and functionality. Sale of unit comes with a 30-day money back guarantee return policy. Please feel free to contact us with any questions. Labline 3540 shaking water bath 30.2L capacity 40 ? 400 strokes per minute, 1.3cm circular orbit Temperature range (with lid): ambient to 65oC The Labline 3540 shaking water bath features continuous or timed shaking with speed settings from 40rpm to 400rpm. Analog dial controls and a hydraulic thermostat is best for applications that don?t need frequent temperature adjustment. The 3540 shaking water bath has a mechanical timer that can be set for continuous operation or one minute increments up to 60 minutes. An audible alarm sounds at the end of the set shaking time.