A method of forming a semiconductor device is disclosed. The one-way valve comprises a valve seat, a diaphragm mounted inside the valve seat, the diaphragm is also in linear contact with a projected annular ring, a stop device pressed on the diaphragm, a valve cap screwed to the valve seat and pressed the stop device. The computing device includes a pipetting module and a first communication interface. The cable spool assembly includes a drum portion and a tray assembly engaged to the drum portion. A cap member preferably integrally formed with the housing encloses a periphery of the beam deflector.