I've seen the ad, but I don't think it was particularly "hand held." We decided that the instrument had to make certain assumptions about the geometry of the cable you put in there. Or maybe you had to tell it about the geometry.
In any case, I don't think they made any claims of being able to measure balanced currents in coax.
------------------------------------------------ Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
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