Posted by a reviewer on Amazon

When you first turn it on dial it down until it does not show anything

Posted by a reviewer on Amazon

Eventually you will zero in on the source

Posted by a reviewer on Amazon

The scanner was able to detect several pieces of our equipment to test its sensitivity and ability to detect the type of equipment we would be looking for

Posted by a reviewer on Amazon

The only issue we had with it and the reason for 4 stars instead of 5 is it is some what difficult to get the sensitivity set where it is not constantly giving false alerts yet still sensitive enough to detect actual threats

Posted by a reviewer on Amazon

As you move through a space it is necessary to continually adjust the sensitivity