His sharp solution is a food grade steel tube with one rolled edge and one cutting edge. It slices between the fruit peel and flesh in one smooth motion.
"I've loved seeing the people's reactions at how quick it's done," he said.
Fieldays punter Roger Bourne works for Plant and Food Research of the Crown Research Institutes and had an industry interest in Christian's Kiwi Peel.
"I was initially drawn to this product because we work really closely with Zespri," Bourne said. "I saw the kiwifruit and thought, oh cool something to do with the sector that I'm interested in."
He was impressed with the young man's nous.
"He had a problem for himself and he went, 'I'm gonna fix that' and that's an awesome attitude. To go, hold on if I'm not the only one that maybe has this problem and to start that process of thought at that age and he got his dad involved and his dad's mate, and all the rest of it. And now he's fronting it. I think that's awesome," Bourne said.
The plant and food researcher said the best inventions solve a real-world problem and Christian's invention was really practical.
Morrinsville dairy farmer Glenn Townsend was passing by when he directed his two eldest sons, Tristan, 8, and Henry Townsend, 5, back to the Kiwi Peel stand.
"It looks like it's an easy kiwifruit peeler which should make it easier than chopping them up with a knife," Townsend said. "These kids love their kiwifruit so that's why I looked at it."
He made his $20 purchase and handed his sons their newest utensil.
Tristan said the 12-year-old inventor was "pretty amazing" and his brother Henry nodded his approval of kiwifruit and the peeler.
Christian intends to start out small and grow gradually.
"Innovation is the thing that starts off real little and gets sometimes pretty big and sometimes massive."
Watching his son and his innovation grow was Christian's inventor dad who had cut through enough kiwifruit in two days to be glad he wasn't peeling them the old-fashioned way.
"Don't stop inventing," he said. Christian had sold around 85 Kiwi Peels and was leaving his stand to pick up support from another source — off to the Zespri exhibit to get his fifth box of kiwifruit.
"They give them to us for free," he said.