Apparatus and techniques for mounting frameless photovoltaic modules reduce module stress induced by the mounting configuration. The display units display information from communication channels and images taken in by the camera. Delivery means are provided to deliver a metered quantity of sample fluid to the sensor array. The methods falling within the scope of the present invention include providing a CMP polishing apparatus, providing a deformable pad of the present invention, providing a polishing pad attached to the deformable pad of the present invention, and bringing a substrate having a material layer to be polished in contact with the polishing pad. Analogue input terminals are provided for receiving analogue input signals, for example, analogue signals from external systems which may be controlled by the output signals from the DACs.