A surgical-training device for measuring roughness (non-delicate manipulation) during a simulated-surgical technique is described. The device has a housing, a platform, and a sensor module. The platform is movably coupled to the housing, and is configured for three-dimensional motion relative to the housing. The platform is further configured to move from a start position to a displaced position when a force is applied to the platform as a result of a user performing a simulated-surgical technique on the platform. A sensor module, coupled to the housing, is configured to determine when the platform moves a distance (from the start position to the displaced position) that exceeds a preset-threshold distance. If the preset-threshold distance is exceeded, sensor module indicates (by visual and/or auditory alarms within the device, and/or computerized counting and scoring reports) that the user applied excessive force, and was therefore too rough when performing the simulated-surgical technique. A method of manufacturing a surgical-training device is also provided.