Unit is quite valuable in providing cleaner fat columns and increasing the speed of testing. Racks are driven electronically, and impart an elliptical motion which simulates hand shaking. This will thoroughly and rapidly mix the samples and acid reagent. Bottles may be removed or added from the shaker while in motion. Therefore, test bottle contents are immediately and effectively mixed while the operator continues to dispense acid charges into other test samples. Has variable speed control. For operation on 110 volt, 60 Hz. Warranty: 90 days.