He mea hanga motuhake mō waho, ko te pouaka mēra nui te otinga whakahaere mōkihi tino pai, e whakarato ana i te tiakitanga mō āu mēra me ngā mōkihi nui puta noa i te tau. Mā te haumarutanga matatau, me te hanganga pakari, ka noho tēnei pouaka mēra hei kaitiaki mōkihi tino pai.