Billionaire investor Warren Buffett's trip to a Japanese plant Monday may "shine a light" on investment opportunities in a nation hampered by the March earthquake and the global market rout.

Buffett, chairman of Berkshire Hathaway Inc., is visiting Japan for the first time to tour Tungaloy Corp.'s plant in Fukushima Prefecture after canceling his trip in March when the country was hit by a record earthquake. Iscar Metalworking Cos., an Israeli firm and Berkshire's largest acquisition of a non-U.S. firm, in 2008 bought a 71.5 percent stake in Tungaloy, which makes tools for cars and planes.

"This is a wonderful day for me," Buffett, 81, told Tungaloy executives and local officials after arriving at the plant in Iwaki by helicopter. "The world has had its eye on Japan and especially this area."