Failures of Gearboxes within Offshore-Windpark-Applications lead to long downtimes and high repair/replacement costs. The strategic goal for Offshore-Windturbines is to avoid gearbox failures at all. This goal is only then realistic if the real loads and forces are measured in real time at high frequencies by the gearbox. The paper will report about a Mechatronic gearbox-prototype of the 1,5 MW-class with integrated contactless load-sensors, analytic electronics/software and a highspeed fieldbus-interface for communication with the turbine controller. The full integration of mechanics, electronics, software and communication.