You are welcome .....
The manual voltage stabilizer that I am talking about is a generic item.
All manual stabilizers are same. They all have the same controls, viz.,
(1) A meter,
(2) A 8 position rotary switch,
(3) One indicator lamp,
(4) Boost-Buck toggle switch.
These are on the front. On the back it has the mains cable entry point, and
the mains outlet (3 pin socket), and the fuse.
These items are churned out of the cottage industry, from NewDelhi's Lajjpatrai Market, at very competetive
prices and supplied all over the country., B'coz of which it was never appealing to the big business
houses/corporates to get involved. As a result there is no specific brand image here.
One can buy these from the local electronics market, or get help from the local winders (fan, motor etc)
Hope this helps.