He decided to design the handle after becoming frustrated while working on the dairy farm putting up electric tapes which the cows just walked through, Mr Pearce said.
"I tried to find something like it on the market to electrify the tape and couldn't so thought I'd just make it. It's been three years in the making. You can use it with power or without depending on what you need.
"It's virtually indestructible. It's made with stainless steel and UV protected plastic. You can easily see it if you drop it in the grass. You can run it over with your tractor and it won't break."
Farmers seem to like the concept, too.
"They appear to be popular ... People are amazed and buying them," Mr Pearce said.
Tirau dairy farmer Graham Ball bought a half dozen of the Zammr handles while The Daily Post was at the show.
He said he was sick of losing his old fence handles and one which became live was suitable for him with cows ignoring his temporary gates and walking through them often.
"If I can't find this in the grass I'd have to be blind ... my cows won't be having free-range grass any more. I can't wait to try it out."
If you are interested in checking out the Zammr handle go to www.zammr.co.nz.
The 44th annual Fieldays event began on Wednesday at Mystery Creek and ends this afternoon. It is the biggest farming event on the calendar where people can check out the latest technology.
Organisers say a record number of 30,000 people flocked to the event on opening day.
