Disclosed herein is a device for gauging medication dosage. The method may include displaying first, second and third navigation controls. A switch is connected in parallel to the relay contacts and is configured for providing a portion of the input power as supplemental load power to the output as a function of back EMF energy. The present invention spaces the handle attachment from the valve for improved visibility of the sewing ring and the outlet end of the valve during attachment. The sealing element may be metallic and is configured to releasably seal the opening when the valve member is urged in a direction towards the opening. Each pixel also includes a second, relatively higher gain, lower dynamic range amplifier circuit which is optimized to provide a high signal to noise ratio for low light level input signals from the IR detector.