The present invention is to provide a display for a secondary battery in response to the status thereof. According to the invention, a sensor determines the capacitance between a sensor surface and a section of the finger, an image of the finger section is generated from the voltage differences and said image is compared with memorized finger sections. By rotating its inlet port aperture from downward facing when the soda keg is full of a beverage, to upward facing when the soda keg is nearly empty, the floating fluid inlet avoids picking up sediment from the bottom of the soda keg. At least one of the arms may have varied flexibility over its length in the form of one or more discontinuities of stiffness or flexibility at an elbow region or other variances in flexibility over the arm’s length.