A stand for positioning a mobile electronic device with a built-in camera to an object supported on a support surface is shown. The tire cord fabric is comprised of warp cords oriented in the longitudinal direction and weft yarns oriented in the lateral direction. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between two current electrodes energized by an excitation source to create an oscillatory electric field in a borehole wall. The gamma decoder receives a plurality of gray scale voltages, and selects and outputs one of the plurality of gray scale voltages in response to the display data.