A rotor blade including a root attachable to a rotor hub. The communication between the power source and the controller may be electrical or photo communication, and the power source is preferably remotely located relative to the other elements of the hydraulic actuator system. A controller effects control for carrying unprocessed and processed samples among the given cassette, the waiting cassette and the vacuum processing chamber, so that a mixture of both processed and unprocessed samples does not exist in the given cassette or the waiting cassette. The device is used to enable golfers to accurately read the green and determine the speed and direction along which a particular ball should be putted.