Metal Detector?

Hello,
I need some advice on Metal Detector's. Here's what I need to know:

Are there metal detector's that have the technology to show me what it has found on the screen.

What can I get for $500?

Where can I get it?

I am going to Treasure Hunt, So what's best for me?

Thanks!
Also, The ground where i live is thick with clay!

Metal detectors scan any form of metal around you. And more likely if you do fail the metal detector test, then they are probably going to take out a handheld metal detector to manually scan.