Hydraulic power units (HPUs) pressurize oil to power hydraulic lifts, tools, and equipment. They provide higher amounts of force than traditional electrical and mechanical systems, allowing them to lift and move heavier loads in a smaller footprint. They also provide precise movement and speed control over a wide range of speeds and load weights. AC hydraulic power units are powered by an electrical power source and are most often used for stationary applications such as industrial tools and auto lifts. DC hydraulic power units power mobile, agricultural, and marine equipment, and truck lift gates. Gasoline and diesel units are used to power portable hydraulic tools, such as saws and jackhammers.