19-550 CST/berger Magna-Trak 100 Magnetic Locator with Soft Case The 19-550 CST/berger Magna-Trak 100 Magnetic Locator with Soft Case offers a digital bar graph display, in addition to a standard audio tone, to precisely identify the target object, especially in noisy, congested areas. An additional feature on the 19-550 CST/berger Magna-Trak 100 Magnetic Locator with Soft Case is a visual reminder when batteries are low. 19-550 CST/berger Magna-Trak 100 Magnetic Locator with Soft Case features simple, waterproof, push-button membrane pad operation.