An electronic measuring wheel has a casing, a distance wheel and an operating shaft. A preferred embodiment comprises a control circuit coupled to a dual function OCDODT circuit with an enable line coupled to the control circuit. The support substrate in one embodiment is a sheet that is further divided into two contact members separated by a resilient coupler. , time-path functions, are processed by the control units. The data processing device may then choose, based on a result of the analysis of the charging condition, a result of the analysis of the viewability condition andor a result of the analysis of the environmental condition, display of content in a manner to attract attention to the data processing device.