CST/berger Magna-Trak MT101 [19-555] Magnetic Locator with Volume and Sensitivity Control Knobs. The CST/Berger Magna-Trak 100 Series Magnetic Locator is a reliable device designed for detecting magnetic fields emitted by ferrous and ferromagnetic objects. Featuring a lightweight aluminum tube and water-resistant plastic housing, it is ideal for locating iron, cobalt, or nickel underground, underwater, or in snow. It is equipped with advanced magnetic toroidal sensors and electronics to provide a depth detection of up to 20 inches. This magnetic locator by CST/Berger offers audio and dual visual alerts with its LCD indicator with a digital bar graph display. It has a simple, push-button membrane pad to allow one-hand operation. For maximum functionality and versatility, optional quick-action control knobs enable volume and sensitivity adjustments (MT101 only), while Erase feature and power line indicator ensure accuracy and ease of use (MT102 only). The CST/Berger Magna-Trak 100 Series Magnetic Locator has an overall length of 42 inches. Its ergonomic design and easily accessible battery compartment guarantee convenience when working. With a battery life of up to 100 hours, it is perfect for all magnetic locating jobs. It also comes with a five-year manufacturers warranty and a soft padded carrying case for storage and transport.