RIDGID 21893 SeekTech SR-20 Locator, Line Tracer and Underground Utility Locator Large LCD screen graphically displays representation displaying proximity signal, signal strength, target line and guidance arrows to quickly identify distortion and help map difficult locates Omni-Seek technology increases accuracy and efficiency when searching in passive mode- continuously searches passive power and radio bands to locate and avoid unknown metallic lines Trace any pipe locator frequency from 10 Hz to 35,000 kHz* while utilizing plumbing camera snakes, sonde (beacons), and wire transmitters for better underground utility location and pipe line tracing 3 antennas offset 120 degrees from each other in each housing and 2 gradient antennas (8 total antennas) make it easier to pick up the signal regardless of orientation and angle Continual Depth feature increases productivity by showing depth changes of signal from underground pipe in real-time