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graph 16
b)Holding a 25￠ silver coin, slowly move closer to the probe plate. At
about 7"-8", the first signal strength LED lights up and the sound
becomes louder. Continue to move the 25￠ silver coin closer to the
probe, and all four signal strength LED lights will light up and the sound
will be louder. Then the depth cursor indicates that the depth drops
until only one is left, indicating that the metal has gradually approached
the center of the probe. (See graph 17)
graph 17
18
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