Ever seen or used these electronic testers?

[Martin in China]

Did anyone ever seen or maybe even used these testers before and if so, are they any good?
http://www.bvreefclub.com/uploads/monthly_2015_06/T1kufQFtpcXXXXXXXX_!!0-item_pic.jpg_600x600.thumb.jpg.57742c2151c29a082cb56a54408cb164.jpg

[droog]

I saw them on some TaoBao stores in China but never used. The reviews I found via google were not favourable and I think you need software on a PC also. If you do use them please post some feedback.

-droog

[bertoni]

I don't remember any reviews posted in this forum, either.