Audio Target ID, Iron & Steel, Gold, Pull Tabs

AUDIOTARGETID

-Motionmodesonly

In the DISC, NOTCH or AUTONOTCH modes, the detector emits three distinct tones, which classify metal objects into categories

IRON & STEEL:

In the DISCRIMINATION mode most iron and steel objects will induce a low tone. Highly oxidized iron can induce a high tone, depending on the Disc/Notch control setting. For instance, some rusted bottle caps will induce a high tone and indicate to the right of the LCD target display.

GOLD:

Gold objects will induce a low or medium tone, depending on their sizes. Very small gold objects will indicate on the left-most segment. Large gold objects will read under the Zinc segment. If you are gold prospecting, you will usually be looking for natural gold in an area which it does not contain much trash, and can therefore ignore the specific segment descriptions.

PULL TABS:

Pull tabs are the most bothersome trash items for detectorist. Most will induce a medium tone. Most will be eliminated automatically in the AUTO NOTCH mode, or alternatively be manually “notched out” in NOTCH mode with the Disc/Notch control. The older pull tabs (those not attached to the can after opening) are sometimes broken in half; these broken tabs can induce low tones. Highly oxidized pull tabs can also induce high tones.

It can be very difficult to differentiate pull tabs from gold rings. When they both induce medium tones, you might notice a “double beep” from a gold ring but a “single beep” from pull tabs. To achieve this distinction, sweep the search coil very slowly, and at different angles. Two tones might signal as the detector passes over each side of the round ring.

COPPER, SILVER & BRASS:

Most valuable coins are composed of these metals and will usually induce a high tone. Valuable objects other than coinage can also be composed of copper, silver and brass.

LOW TONE

MEDIUM TONE

HIGH TONE

Nails & Bottle Caps,

Gold & Nickel

Old & New Pull Tabs, Zinc,

Pennies (Post 1982), Larger

Gold Objects

Copper, Silver & Brass

Copper Pennies (Pre 1982)

Audio Target Identification (ATI) classifies metals into three categories.