Good on you for bringing up the multi-box issue Trumpy. I have done some current tests on these multi-boxes too, with the same scary results as yours. Problem is: that multi-boxes aren't a "Declared Article" under our commerce law. Even though they contain an overcurrent device. Which means that neither the manufacturer or the importer has the ability to guarantee the calibration of the overcurrent device. Circuit breakers, fuses and other current-protective devices are all "Declared Articles" whch are required to be stamped with an approval number which effectively guarantees its callibration. Its great to hear from people like you Trumpy with experience of the end result of crap products like the
4 dollar multi-box.