A device for the precise and accurate potentiometric pH measurements in situ. For example, in one embodiment, a USB hub may include a shared memory device, at least one faster data handler coupled to transfer data between the shared memory device and a faster port, and several slower handlers each coupled to transfer data between the shared memory device and a respective one of several slower ports. The electrical cable includes a number of conductors respectively electrically connecting with the printed circuit boards of the electrical connector components and a metallic braid electrically contacting with the conductive shells of the electrical connector components. When the product core is rotated while paper is being dispensed, the passage of air through the dentate ends helps to dispense and distribute the scent through the environment proximate the paper dispenser.