SubSurface Wireless Inductive Clamp for Pipe and Cable Locator Choose Model:6.5" Wireless Inductive Clamp The tapered plumb bob pocket Choose Length:66 feet The tapered plumb bob pocket with a snap button strap secures up to a 16 ounce plumb bob The SitePro SureGrip™ 5274 Quick Release Cradle securely holds your Surveyor 2 or Allegro 2 data collector without risk of damage It operates independently without requiring a separate transmitter and supports three common locating frequencies: 33 kHz The Wireless Inductive Clamp is a self contained transmitting inductive coupler used to apply a tracing signal to an insulated target conductor when direct connection is not possible or when service cannot be interrupted