A method and apparatus for detecting and locating leaks in buried pipes is disclosed in which ground penetrating radar, induction, acoustic, and vacuum excavation systems are selected based on soil conditions and then employed in selected combinations. In response to detecting an abnormally high concentration of hydrogen sulfide gas, the instrument triggers the fault monitoring system to record an H2S fault and convey that information to a remote computer. A fastening mechanism is attached to the holding part. The radial interior surface of the receiver assembly coupling and the radial exterior surface of the bayonet assembly coupling may be configured so the receiver assembly coupling slidably and lockingly receives the bayonet assembly coupling in any of a plurality of positions along the length of the receiver assembly coupling. The determined data and the data relating to the feature retrieved from the decrypted code are compared to authenticate the article. A user can utilize the feedback effects andor benefit effects to alter their inputs to control the generator sequence.