Zvigadzirwa zvedu zvinosimbiswa nehunyanzvi SGS yekuongorora nzvimbo. Kuti tive nechokwadi chemhando yezvigadzirwa zvedu, isu tinonyatso kutevedzera EN1935 yekuyedza chiyero tisati tatumira zvigadzirwa kuti tive nechokwadi chekuti vapasa bvunzo yakasimba yekusimba kusvika makumi mashanu nguva. Kune zvigadzirwa zvakakanganisika, isu tine 100% sampling yekuongorora, uye kunyatsotevera yemhando yekuongorora bhuku uye maitirwo, kuitira kuti hurema hwezvigadzirwa huve pasi pe3%.