Crappy power adaptor

Me and my brother are trying to work on some electronic project, and he left me to put together the parts.

I have never done this, I just read the instructions and try to follow them.  The most challenging perhaps is the soldering.  Gee, two days ago I went to two shopping centers where I thought I might find the soldering iron and the solder.  Took me a while to find, but once I know where those things are, it's easy.

Now the project requires a power adapter with an output of 5V.  I found a really nice adapter with which it is possible to switch between several different output voltages and even the polarity of the plug!  And on top of that, it was very cheap.

But when I bring it home, I see it just doesn't work.  Then I realize it would be really useful to have a multi tester, to measure voltage, etc.  So I go again I go out to look for this device.  When I finally find it, I also see a desoldering tool, which I think must be very convenient to have, so I also purchased it.

Back at home this afternoon, I use the multi tester to check the marvelous power adapter, and no wonder I didn't see it work... it's a piece of crap!  It's supposed to have selectable output between 3V and 12V, but with the tester I see it actually gives between 13V and 22V.  What the fuck?  And on top of that, it has a sticker that says " Q.C. Passed".  Mother fucker.