This VWR 200 Magnetic Stirrer has been tested and is guaranteed to be fully functional. This item came from a local lab that had surplus inventory. Stirrer shows 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. Manufacturer Description This is a compact stirrer that mixes up to 1 liter of water. The product is ideal for applications that require repeatable result Features: Electronic speed control provides complete control from extremely slow stirring of 100 rpm to a fast 2500 rpm. Operate continuously for hours with little speed deviation and with minimal heat build up. Aluminum case houses a powerful motor and an alnico magnet With ring stand mount on rear of the unit deliver reliable and consistent stirring Rugged 5x5" aluminum top plate will not chip or crack. The built-in support rod holder with locking knob accepts an optional support rod and clamp kit. Optional support plate allows hot plate to be mounted to lab frames or ring stands. Speed range of 100 to 1200rpm