The PipeCheck 3 is the latest in the PipeCheck Series that has been used successfully in the UK Gas and Water lndustries for many years. Using ultrasound, the PipeCheck 3 indicates whether a pipe contains water or not. The pipe is cleaned by removal of all external soil and loosely adhering rust. A coupling gel, which enables transmission of sound from the instrument to the pipe wall, is applied. PipeCheck 3 is a simple to use hand-held instrument which positively identifies pipes filled with water and other fluids. PipeCheck 3 is designed to address the major identification problems, experienced by engineers engaged mostly in the water and gas service industries, when old cast or spun iron pipes are exposed.When the instrument detects a full water pipe a green light and audible alarm are activated. This can only occur when certain electronic criteria are satisfied within PipeCheck 3. Otherwise a red light shows. lf the pipe contains gas, whether natural gas or air, or other contents the sound remains within the pipe wall and the red light is triggered, because sound will not travel within the pipe.