Abstract: A medical treatment system comprising a housing; a recess defined by the housing; and a keyboard connected to the housing by a mechanism configured to permit the keyboard to move between: a deployed position in which the keyboard is disposed outside of the recess at an angle of 10° to 80° relative to a front surface of the housing; and a stored position in which the keyboard is at least partially disposed in the recess and keys of the keyboard are exposed for use by a user.

Abstract: A digital hydrometer and methods of digitally displaying a specific gravity measured by a hydrometer are provided. The digital hydrometer can comprise a base, a displacement vessel, an inductive distance sensor, an output circuit, and a hydrometer float. The displacement vessel and inductive distance sensor can be mounted in or on the base. The displacement vessel can hold a displacement fluid. The hydrometer float can float in the displacement fluid. The output circuit can be in electrical communication with the inductive distance sensor and comprise a digital display device configured to display a digital value that is commensurate with a change in impedance attributable to the proximity of a metallic object, in the hydrometer float, to the sensor or its inductor. The digital value can be a specific gravity of the displacement fluid.

Abstract: A digital hydrometer and methods of digitally displaying a specific gravity measured by a hydrometer are provided. The digital hydrometer can comprise a base, a displacement vessel, an inductive distance sensor, an output circuit, and a hydrometer float. The displacement vessel and inductive distance sensor can be mounted in or on the base. The displacement vessel can hold a displacement fluid. The hydrometer float can float in the displacement fluid. The output circuit can be in electrical communication with the inductive distance sensor and comprise a digital display device configured to display a digital value that is commensurate with a change in impedance attributable to the proximity of a metallic object, in the hydrometer float, to the sensor or its inductor. The digital value can be a specific gravity of the displacement fluid.

Abstract: A medical treatment system comprising a housing; a recess defined by the housing; and a keyboard connected to the housing by a mechanism configured to permit the keyboard to move between: a deployed position in which the keyboard is disposed outside of the recess at an angle of 10° to 80° relative to a front surface of the housing; and a stored position in which the keyboard is at least partially disposed in the recess and keys of the keyboard are exposed for use by a user.