Barack Obama began the last day of his final visit to Germany as US president on Monday by visiting the Hanover industrial trade fair with Chancellor Angela Merkel, before holding talks with European leaders on global business and security issues.
"This is my chance to tell people come here and buy 'Made in America'," Obama said at the fair, adding that he was in Hanover because he was "proud to showcase America's spirit of innovation."
Merkel and Obama officially launched the world's biggest industrial trade fair, the Hannover Messe, on Sunday. The US is for the first time the trade fair's partner country.
"The proof of the pudding is the eating", the chancellor said in English as they began their tour of US and German exhibitors who have set up shop at the fair.
Obama and Merkel visited booths in the US pavilion manufacturing 3D printers, computer software and space technology, accompanied by a mass of press cameras, photographers, security personnel, reporters and cabinet ministers.
"Chancellor Merkel is a scientist so she can figure these things out," Obama told exhibitors as they toured the fairgrounds.
Merkel, who is a trained physicist, stood out against a sea of black-suited figures at the fair by wearing in a blue jacket.
"Once I'm out of out office I'm going to have some time to start designing things," Obama joked at one stand.
Obama's two-day visit to Germany is the last port of call on his three-nation trip, which included stops in Britain and Saudi Arabia.
The trip also comes ahead of the July summit of NATO leaders in the Polish capital, Warsaw.
After a speech to business leaders on Monday morning, Obama will join Merkel later in the day for talks on current global issues together with French President Francois Hollande, Italian Prime Minister Matteo Renzi and British Prime Minister David Cameron.
The talks, at what has been billed a mini-summit, will also cover the fight against the Islamic State extremist militia in Iraq and Syria, Europe's refugee crisis, the conflict in Libya, Britain's referendum on EU membership, the proposed US-European trade deal and steps to contain an aggressive Russia.