A titration unit with a reagent recirculation system for manual titration directly from the reagent bottle. Power supplied by a solar cell. Advanced energy concept, precision results - sets standards as the world's first digital burette with integrated solar cell. The power supply for the electronics and display is derived exclusively from an integrated solar cell. Batteries can be completely dispensed with. Easily replaceable valves, individual calibration with "Quick-Cal" and permanent storage of the manufacturer's calibration facilitate rapid and flexible adaptation. The vivid digital display prevents meniscus reading errors and is always clearly legible, regardless of the viewing angle. The handwheels with soft touch surface are ergonomically optimised for particularly precise control.