V&A ( http://www.mastech.com.cn ) is related to http://www.mastech-hy.com ?
AFAIK they are not related others than V&A being cheeky and grabbing the mastech.com.cn domain, leaving Mastech with the p-mastech.com and mastech-hy.com domains (mastech.cn is in the hands of some dubious SEO, while mastech.com seems to belong to an unrelated US recruiting company).
There is nothing special about the V&A meters. Some other no-name companies rebrand them. You can e.g. find their rebranded multimeters in other colors on ebay.
I think someone once showed the inside of a V&A multimeter here, and it looked rather cheap and not well made.
They have also some lcr meters that look similar to tonghui:
That could be. V&A bench multimeters (VA80, VA81) look very much like Tonghui meters. But since Tonghui offers more versions of that bench multimeter it is likely that Tonghui makes them, and V&A just rebrands them.
The question with that LCR meter is who makes it, Tonghui or V&A, and who is just rebranding it, V&A or Tonghui? This is difficult to say. Both companies apparently do produce their own meters. V&A might enhance their product portfolio with stuff from other manufacturers, like the VA80. So a random guess would be that Tonghui also makes these LCR meters.
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