A differential amplifier stage and method for offset cancellation include an amplifier having an input and an output. The housing uses compressed air to move a golf ball 14 and golf tee 16 away from the device and drive the tee 16 into the ground with the golf ball 14 placed thereon. Magnets are mounted on a second side of the planar member, opposite the first side, for releasably mounting the planar member on a flat substrate. The reference intake air amount is corrected with a ratio between an air density under a current condition of a current atmospheric pressure, a current intake air temperature and a current gauge pressure and an air density under the reference condition to calculate an intake air amount for the current condition. At the same time, a reference signal used in the servo circuit is changed over to the reference signal produced in the servo circuit. After a lapse of required development process time, a rinsing solution supply nozzle moves from the side of the first edge of the substrate to the side of the second edge thereof to apply a rinsing solution across the major surface of the substrate.