The Leica DD120 kit offers everything you need for ease of use capabilities by requiring minimal adjustment to locate services. Removing the sensitivity control also ensures detectable services cannot be missed where the user reduces sensitivity too much. The DD120 a built in self-check which can easily be performed by staff or users to ensure units are working correctly. The signal strength indication (ssi) – features numeric signal strength readout, specifically designed for easy cable identification. The safety feature of the DD120 offers Hazard zone, which alerts the user to shallow services within a few feet of the locator. This can enable users to Change their method of breaking ground and prevent cable strikes. Lastly the 8Khz and 33Khz frequencies offer a mixture of low and high frequencies giving the operator flexibility. When it has to be right the choice is always Leica systems.