Review of Hameg Power Meter

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My error, you are right HKJ.  I've corrected my post.  For 2x the price, then, the Gossen offers quite a bit of capability.

but I think its more like the Yokogawa class, and at > 4x the price, ~ $3500 US vs $815 for the Hameg

I do not know where you got that price from, at Conrad it is about €1000 or $1300 and that includes German VAT. It is more expensive than the Hameg, but only about 50%.
Computer interface and external power supply is rather expensive, but it will not be anywhere near $3500.