VEVOR TS26 Mode D'emploi page 14

4. To prevent the zinc penny from being detected, set the
ALL METALS/DISC knob to about " 5 o'clock " ( see Figure 12 ). By now,
only the 25-cent silver quarter should be detected.
Note: The discrimination position of aluminum is similar to that of silver. So both
metals will be detected at the same time. The discrimination position of gold is
similar to the nickel setting.
Through the above tests, you can quickly know the performance of the detector
and know how to use the detector.
Tip: During test, the metal sample which you are using must be in motion.
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