The Opera Duo from IDS North America is an easy-to-use ground-penetrating radar system that uses a dual-frequency antenna to simulta-neously detect both deep and shallow buried metallic and nonmetallic pipes and cables and display them on the same screen. It provides easy-to-interpret results in real time, and locates the exact position of pipes, cables and other features of interest. It is compact, easy to transport and deploy, and available in two versions: a small and lightweight two-wheel version and a four-wheel version more stable and adaptable for use on rough terrain. 303/232-3047; www.idscorporation.com/na.