To make it short: The device works, but the processing is really bad. The supplied bag looks as if it were already in use for many years and also the device itself is made very cheap. The individual test button hung in with me, so I screwed the unit had to make viable the button. And I have also seen the board: The production is really allerübelste soldering artwork that better with a bit of effort hinbekommt any layman, the first cold solder joint is here already inevitable.
I had an identical looking device by Voltcraft - although Voltcraft now not necessarily one of the best brands, so the old unit was processed but worlds better. I have spared the return due to it low price, but I would buy this unit again. The star there just because the device (contrary to expectations) works tolerably.