The present invention provides a system for determining characteristics of substrates, such as the presence of contaminants, shape, as well as the spatial relationships between spaced-apart substrates. These polymers have many uses in various mediums, including wastewater systems. The grouping is then forwarded to an encoding clerk who has the highest priority and is available for the grouping. An illumination source is provided within the device to illuminate nipple orifices when a nipple is positioned within the hollow receptacle. A second spacer material is formed to entirely cover the first mandrel, the second mandrel and the substrate.