Advanced Pro Bug Detector This is one device that government agencies and private investigators use.   It will give you a visual signal  (no sound or vibration)   with a Sweep range of up  to 3.0 GHZ . Many private investigators and other professionals prefer  this model because it gives them an exact signal strength reading .  No bells and whistles,  just straight forward information that a professional needs. Advanced Pro Bug Detector Item : 2003-2A ----------------------------- Price : $ 495.95