Milking shed herd gate manufacturer Reporoa Engineering is a perennial exhibitor at Fieldays.
Managing director John Perham said the show gave the company's products maximum exposure in a short period of time.
"It's our busiest time of the year," said Mr Perham.
"We've been here for a few years now, it's a brilliant spot with plenty of walk-by traffic.
"It's the only place we could get 120,000 potential customers viewing our products in four days - it would be impossible to meet that number face-to-face in that time."
He estimated 60 per cent to 70 per cent of all Fielday attendees walked past the company's exhibit stand inside Gate One.
"This is our biggest promotion - we get many overseas buyers here for our gates to be used around the world."
Among other Rotorua companies present at the Fieldays will be Volcanic Hills Winery, Woodmetrics Forest Marketing and TechiPharm Group (sheep, dairy, beef).
National Fieldays opens tomorrow at Mystery Creek, Hamilton and runs until Saturday.
For information visit www.fieldays.co.nz.