Waldbeck Azteca Manual De Instrucciones página 37

5. Make use of the sound, to help discrimination
In the process of detection, you needn't always watch the screen. And the
sound identification system will sound four frequency tones to help you
discriminate the targets.
Low pitch——nickel coins
Middle pitch——pull-tab, soda bottle and zinc coins
High pitch——copper, aluminum and silver metal
6. Make use of the digital cursor, to help discrimination
The following table is used as a preliminary guide. The approximate ranges
coin metals are listed in the table. When detecting, there may be some
changes in the number, depending on the composition, size, shape, distance
from the search coil and speed of scanning. The surrounding soil also affects
the numerical value. There are differences in casting coins in different years.
The values in the table are only reference. Gold has a wide numerical range, a
thin ring is about 45, and a rough ring and gold coin may up to 70-80.
Number range Possible Metal
01 - 40 Iron
41 - 55 Nickel
55 - 65 Pull-tab
65 - 75 Zinc, soda bottle
75 - 85 Copper, aluminium
85 - 99 Silver
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