This invention relates to a window pane provided with a plurality of heating resistors and moisture-sensing probes. The invention is particular useful in operative association with a circuit arrangement for automatically controlling the heating circuit of the glass pane, i.e., in association with a circuit arrangement which automatically switches the heating circuit on when the glass pane becomes fogged and switches it off once the transparency of the pane has been restored. It is known that glass panes equipped with an electric heating system have many industrial and civil uses. In its use on vehicles (motorcars, airplanes, ships), the electric heating has the purpose of freeing the external surface of the glass pane from snow or ice and its internal surface from fogging caused by the condensation of water vapor upon it.