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The PTFE PTFE magnetic centrifugal stirrer, is sized to fit a regular 10mm spectrophotometer cuvette and offers fast mixing in both horizontal and vertical axes with minimal vortexing when set up on a magnetic stirring machine. The cross channels in the upper face create centrifugal pumping action that delivers aeration-free mixing. Photometric analyses may be performed without interruptions while chemical agents are added to the cuvette. The Cell Spinbar is ideal for test tubes as well. The PTFE coating is designed to provide scratch-free operation in cuvettes and the bar is smooth and crevice-free to prevent dirt entrapment. Minimal vortexing. PTFE PTFE construction. Alnico v encapsulated magnet. Measures 9" diameter by 8" height.