Ko nga mea e whai ake nei etahi o nga taonga ka taea e taatau te tirotiro. Mena he maha atu o mea e hiahia ana koe ki te tirotiro, pa mai ki a maatau koa.
♦ Tohu Tautuhi;
♦ Te waahanga, te tika, te tirotiro tirotiro;
♦ Tātari hanganga matū;
♦ Te Whakamatau Miihini Miihini: te kaha kikii, te kaha whakaputa, te roa, te whakaheke i te rohe, te paanga, te pakeke (Brinell pakeke, Rockwell pakeke, Vickers pakeke) me era atu;
♦ Tirohanga koretake: whakamatau-a-ultrasonic-UT, whakamatautau-korakora korakiko-MT, whakamatautau-VT me etahi atu.
♦ Tirohanga Metallographic;
♦ Hangahanga Micro, Hanganga Tonotono.