Feel free to buy, for such a price, the quality is simply amazing.
A great thing, it's perfect for testing all adapters and chargers in the house and car, now you can calculate original and normal power adapters using a tester.
Pros
Portable, color screen, easy to use, seems to show more or less honest data
Cons
The configuration of the cross is questionable, it may not be possible to test hard-to-reach places