** Shares of Impro Precision Industries 1286.HK rise 6.5% to HK$3.79, on track for the biggest one-day pct rise since August 13 and third consecutive session of gain

** The Chinese castings products and precision machining parts producer says the impact from U.S. additional tariffs is not as extensive as it previously expected as majority of its US customers have agreed to absorb all or a significant portion of the imposed additional tariffs

** Co says it will take appropriate measures to mitigate the impact of additional tariffs on its business and operations

** Hang Seng Commerce & Industry Index .HSNC adds 0.4%, benchmark Hang Seng Index .HSI climbs 0.6%

** YTD, Impro shares up 82.6%, Hang Seng Index up 28.5%

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))