ʻO ke kila pōʻai he pahu kila paʻa lōʻihi me ka ʻāpana keʻa pōʻai.Hōʻike ʻia kāna mau kikoʻī i ke anawaena, ʻāpana mm (mm), e like me "50mm" ʻo ia hoʻi ke anawaena o 50mm kila poepoe.