Double Sided Vertical Shakers automate liquid-liquid extraction by shaking separatory funnels held on both sides of the unit, replacing manual funnel shaking and limiting operator contact with solvents. Adjustable frequency from 100 to 300 shakes per minute across a 40 mm shaking range drives thorough contact between the extraction solvent and the aqueous phase. Vertical and slant modes, interval running and segmented curve programming tailor shaking cycles to the extraction protocol, while countdown and count-up timing keep batch runs repeatable. Typical uses include wastewater and surface water analysis, sewage extraction and sample mixing in quality control and environmental labs.