Wide band EMF detector

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Joined Apr 9, 2017
Hi guys, I see many EMF detectors on the Internet, they can detect EMF radiations below than 1MHz maybe around 60 Hz, many of them,I found some of them with the wide band transistors which they can detect wider band of EMF like UHF band, but I can't imagine an IC version detect very wide band, like a KII EMF detector, so how KII can detect almost any thing?!!!
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