Mitchell Hollows (18) has been named as a finalist in the ASB Bright Sparks awards for a prototype device he created that safely measures the length of paua underwater without harming them.
The ASB Bright Sparks is a nationwide competition for young inventors.
A keen diver himself, Mitchell was inspired to find a way to measure whether a paua was of legal size without lifting it from the rocks.
Normally, paua divers use knives to remove the paua before measuring them.
The smallest nick or cut could have fatal consequences, as paua are haemophiliac.
Mitchell's device uses two highly accurate lasers protected by a waterproof case to indicate whether a paua is of legal size.
It also has a magnetic switch to modify the distance between the two laser points for an accurate reading of the paua's length.
Mitchell was excited to make it to the finals of the awards, as he did not think he would get this far.
``From [finding out], it sort of gave me a boost to start working on it even harder.''
His technology teacher, Stephen Newnham, said it was significant Mitchell was a finalist, as he was recognised based on the time he spent on his concept and website.
It was a clear sign it was a strong idea, Mr Newnham said.
``He has got a really original idea and, taking a step back, it really resonates with people.''
Mitchell also wanted to make a more accurate prototype using parts made from an injection mould as opposed to the 3-D printed model he has.
``If we get more funding, we might have a bit more fun.''
School principal Mike Wright said he was proud of Mitchell's achievements so far.
``The quality of the work he has done and the level of investigation really epitomises 21st-century learning.''
Mitchell is a finalist in the environmental and engineer sections of the Bright Sparks awards.
There is also a people's choice award determined by online voting at the Bright Sparks official website.
Mitchell will travel to Auckland for the awards ceremony on November 1.
