Amprobe-SC-5000-Signal-clamp-for-AT-5000-Amprobe-SC-5000-The-Amprobe-SC-5000-signal-clamp-is-an-optional-accessory-for-the-AT-5000-series-underground-pipe-&-cable-locator-system-that-will-allow-active-locating-of-buried-cables-up-to-4-inches-in-diameter-Amprobe-Sc-5000-Signal-Clamp-for-At-5000