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Step 1 Connect the probe which you would like to use to the control unit. Regardless of which probe you are using, you will always use the same plug for each probe. You can only use one probe at a time for one measurement.
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Ferromagnetic metals Ferromagnetic targets have a positive- negative-signature.
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Non-ferromagnetic metals Non-ferrous targets have a pure positive signature. Non-metallic targets All non-metallic items have a pure negative signature.