Even a small commercial 12V gel- or AGM-battery (6 Ah) is enough to power the HFE59B with UBB27 antenna for 36 hours. Thus, in conjunction with the NFA (current-supplied for 36h by its internal battery), high frequency can be recorded in parallel to the low frequency 3D magnetic field for one and a half days.
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Delivery time: 1-3 days