According to the present invention, a material that can be used as a hole transporting material is provided. Therefore, the dispersion is useful for antistatic purpose of transparent substrates including the display surface of display devices, their surface protecting materials, films, etc. The processor is further configured to perform multi-thresholding of the image data to identify a multi-pixel output tone level, and to generate output image data comprising the multi-pixel output tone level. A valve member in the flow conduit allows a flow channel of the flow conduit to be closed. The test signal received at the second input of the path selector is selected unless a signal is received from the customer premises equipment interface at the first input.