Amprobe AT-3500 Underground Cable Locator Rigorously tested for safety: CE and ACMA compliant, as well as tested in Amprobes state-of-the-art lab Locates underground energized and de-energized wires, cables and pipes Ships complete, ready for use with receiver, transmitter, connection cable, ground stake and ground cable Two passive and one active testing modes for best accuracy Active mode depth measurement up to 16 feet (4.9m) Semi-automatic gain control for fast signal location and control 33 kHz active frequency  best frequency for general locating Precise pinpointing of buried services and exceptionally fast sound and meter response with backlight multiple-segment