Abstract: In certain implementations, a first data element set associated with a first attribute may be provided on a user interface. Individual first data elements of the first data element set may each represent a first value associated with the first attribute. A control element set may be provided on the user interface. Individual control elements of the control element set may each represent an attribute. A first touch-based input indicating an association of a first one of the individual control elements with a first one of the individual first data elements may be received. Responsive to the indicated association, a second data element set associated with a second attribute that is represented by the first one of the individual control elements may be provided on the user interface.

Abstract: A device for measuring height despite difficult visibility comprises a small portable water tank positioned at the location to be measured and a pressure transducer placed at a reference location and connected with the water tank by a hose, whereby the transducer outputs a signal voltage proportional to hydrostatic pressure and hence to the height of the first location. The output signal is amplified and converted to a digital value which is displayed by a digital display calibrated in terms of height.