Repeater stream and Xstream ergonomic, handheld dispensers offer speed, flexibility and the ability to dispense liquids with high vapor pressure and/or high viscosity, while also preventing cross-contamination. They have a motorized piston, intuitive programming and a one-button tip ejection system. When the dispensers are used with the Combitips Plus tip system, the tip is automatically recognized and its volume displayed, enabling error-free volume selection. Both models perform all standard pipetting and dispensing functions. The Xstream can also perform titrations, supernatant removal and sequential dispensing.