Apa silivauiga:
1. Fa'amatalaga atoatoa ma mea eseese;2. Saʻo maualuga maualuga, e oʻo atu i le ± 0.1mm;3. Lelei tulaga lelei, susulu lelei;4. Malosi tete'e corrosion, maualuga tensile malosi ma le vaivai malosi;5. Faʻamautu vailaʻau faʻapipiʻi, uamea mama, maualalo mea e aofia ai;6. Lelei afifi, tau lelei;7. E mafai ona faia e aunoa ma le calibration.