6
you do. With a little practice, however, you will be 
able to tell the difference between a large target 
and a small coin-sized object. 
7. Figure 4 shows some different responses you 
may expect at different levels of discrimination. 
Note that as you increase the discrimination level, 
you progressively eliminate more targets including 
some good ones, such as nickels and gold rings.
NOTE:
The discriination levels shown are typical values only and may 
vary from detector to detector. 
Figure 4. Typical 1212-X audio responses over 1-inch deep targets with search coil 
sweeping 2 to 3 inches above ground.
DISCRIMINATION POINTS