The present invention provides an improvement in the process of producing energy from fuel cells. The injection device comprising a housing, a piston rod for driving a bung of a medicament container, a drive mechanism including a motor for providing an output drive to the piston rod for delivering the medicament; and controller for controlling operation of the device. The apparatus and method can monitor the dosage both before and after it has been added to a carrier substrate. The guide pattern is preferably mapped to the surface of the golf ball.