BTW, the five minutes for the signal line to develop is just an average number for around here. We have very dry ground right now and sandy soil. Damp ground or something more solid gives quicker times. But magnetic disturbances can cause much longer times. Extreme situations maybe have to come back the next day or longer.
This has been my uneasiness about the hand-held devices. Maybe your ground is different, but it still takes time for the discriminated signal line to develop. You pick up lines but they are not to the target, maybe iron or water until the discriminated line locks on.
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