This Fisher Scientific 11-100-49SH Isotemp Magnetic Stirrer Ceramic Hotplate has been tested and is guaranteed to be fully functional. This item came from a local lab that had surplus inventory. Stirrer shows some aesthetic signs of use. We urge customers to view all photos as they show overall condition, included accessories and functionality. Please feel free to contact us with any questions. The Fisherbrand Isotemp 11-100-49SH Ceramic Hotplate Stirrer is easy and safe to use. Excellent for general lab heating and stirring in environments between 4 to 40C (39 to 104F). Used/Reconditioned. Fit virtually anywhere in lab Easy to set analog temperature control knob with graduated scale LED display Top plate and base design diverts liquids away from internal electronics Safety warning system with visual alert protects user from accidental burns Redundant temperature control systems for overtemperature protection Incorporated base mount holds support rods up to 13mm diameter?ideal when using thermometers or pH probes Variable analog stirring control to 1200rpm INSTANT-ON feature begins stirring at low 60rpm to prevent splashing Direct-drive motor/magnet system runs silently 7 7 in. model heat to 540C (1004F) Reflective white ceramic surface is acid- and alkali-resistant and easy to clean Nonheating frame surrounds the heated ceramic plate for added protection