A manually operated implement comprising a housing for accommodating a drive motor that drives a tool. One or more imagers acquire images of a biological specimen on a slide and generate electronic image data. The actuation modules can be constructed as a triple acting actuator having a novel balanced linear-rotary mechanism converter or a double acting actuator with two novel balance guide bars. A transformer is driven by the current mode comparator. Stiffener includes a mounting flange and an opposed flange which have free edge portions. According to the invention, the actuating member has a wheel-side rotational part and an axle-side rotational part, both of which can be rotated about their axes of rotation relative to each other, and the wheel-side rotational part can be deflected through the pivot angle relative to the axle-side rotational part when the two rotational parts are rotated.