The Leica DD300 Underground Utility and Cable Locator offers everything you need for ease of use capabilities by requiring minimal adjustment to locate service utilities. Removing the sensitivity control also ensures detectable services cannot be missed where the user reduces sensitivity too much. The Leica DD300 used in conjunction with the Leica DA300 Signal Transmitter allow users to achieve improved accuracy and application scope. The DD300 has 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 DD300 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. When it has to be right the choice is always Leica systems. WARNING: The Leica Carry Case included in this package can expose you to chemicals including DI(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause birth defects or other reproductive harm.