It may be powerful, but that doesn't mean you can make out what it's being used to magnify. It's like the glass in a mercury thermometer: you have to stand at just the right angle to see it enlarge, and it only works for a very thin thread.
Never mind that, though. What I want to know is why the box demonstrates the use of the magnifying glass for a "one extremely cart" bargain, whatever one of those is.