As natural resources become more limited and more expensive, it has become more important than ever to implement recycling plans. Many municipalities have either begun such programs, or enhanced already existing efforts. Industrial operations have discovered that they can recover funds from materials that have previously been placed into the waste stream. As an added benefit, the costs and efforts to remove waste material are reduced. Some materials that have become attractive for recycling include paper, cardboard products and waste, wood and scrap wood. Almost any metal, including aluminum, steel, copper and stainless steel are good candidates. Glass is yet another appropriate material for recycling. A wide variety of different types of plastics may be economically collected. The key to any effective recycling plan is the ability to determine how much material has been processed. Depending on the volume of product available, [+]