The doohickey in the back, with the three red wires running through it, is an inductive ammeter. 43.2 amperes.
Inductive ammeters are pretty good with AC, less so with DC, even less for DC with a bunch of AC on top of it. Plus, the way they added those extension wires to the torroids makes for tons of EMI.
Overall, their power measurement should be within ~3 percent.
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