A micro-projector, a control signal for a micro-projector and a method for generating the same are disclosed. The DA converters convert the signal to a first and a second voltage. As a result vibrations with a movement component perpendicular to the longitudinal tool axis are damped as well as vibrations that induce motion of the main element in the direction of the longitudinal tool axis toward the main handle. The system also saves the user-entered information for use in determining whether to accept to decline future orders. In one embodiment, the fluid system may be used in a device for measuring blood sugar.