1. A sensor arrangement comprising: a sensor; and an image control, the sensor comprising an array of electrostatic sensor elements, each sensor element capable of producing a respective output signal when the sensor is directed to a region of an object being sensed, the output signals being separately available at a sensor output to provide information relating to an electrostatic charge distribution across the region, the image control receiving the output signals from each or selected electrostatic sensor elements to define an electrostatic charge distribution image, wherein within the array of sensor elements, a visual image camera is provided to provide a visual image, and the image control receives image signals from the visual image camera to define the visual image, the image control including a mixer to receive the electrostatic charge distribution image and the visual image, either as a full frame or a partial frame, and the mixer combining the electrostatic charge distribution image and the visual image by proportionate overlay defined by a predetermined relative ratio specified by the image control.