He momo ngongo poihā te GB/T 5310.

Ko tōna rauemi e tohu ana ko 20 karamu, 20 mg, 25 mg. He maitai waro-waenga, he iti ake te konupora.

E rua ngā momo o te roa o te ngongo poihā: te rahi pumau me te rahi takirua. Ka tatauhia te utu mō ia ngongo kāinga i runga i te roa kua tohua, ā, ka tatauhia te utu mō ia ngongo i runga i te taumaha tuturu.

Ka taea te wehewehe i te tauine takirua kia toru ngā momo:

Rūri poto: hei whakamau i te paipa maitai motuhake ki runga i te tautoko;

Paipa maitai tuimotu āhua motuhake te matotoru ōrite (te whānui o waho iti iho i te 32mm): e whakamahia ana mō te hanganga mīhini, ngā taputapu waipēhi me te tika o ngā āhuatanga me te mutunga mata pai o te paipa maitai tuimotu tino tika;

Paipa maitai kore-paerewa (he whānui o waho neke atu i te 32mm, he whānui o roto iti iho rānei i te 40mm): Whakamahia mō ngā wāhanga hanganga, taputapu me ngā wāhanga miihini.