BJ Enterprises 007 Leak-Guard Tank Monitor combines a 007 tank alarm with a Leak Guard tank gauge to provide audible and visual warning of an interstitial leak. The Leak Guard is a large, visual sight gauge that will indicate with a highly-visible orange indicator if a leak occurs in the interstitial space of a double-wall tank, with a 4-window glass display that is easily read from any direction, while the low-voltage, supervised 007 tank monitoring system indicates a leak by sounding a remote 103-decibel siren and flashing a remote strobe light. The 007 unit also features a remote, indoor-mounted control panel and a 12-Volt DC transformer, while the Leak Guard unit comes with a nickel-plated brass chain that is field-adjustable to 72 in depth.