Things You'll Need
Instructions
Set your detector to "all metal" mode so you can detect each one of your items without discrimination.
Lay out your iron piece, gold jewelry, silver jewelry, bottle cap and piece of aluminum a few feet apart on a metal-free surface. Wave your detector slowly over each piece. Carefully watch your metal detector&'s digital readout or meter reading to know how each metal registers.
Listen to your detector. Your metal detector will make a slightly different tone for each type of material that is registering.
Grab your piece of gold jewelry and place it together with each type of metal item individually. Using this combination method will let you read the differences in your meter readouts and bell tones when gold is next to different types of materials.