<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.vyeti huthibitisha kuwa vifaa vimepitisha vipimo vya utendaji na vipimo vya uhakikisho wa ubora, ni hatua ya kwanza kabla ya mteja kuchagua kifaa kinachofaa.  <response>: certification certify that the devices has passed performance tests and quality assurance tests, it is the first step before customer select a suitable device. 