Cov khoom tseem ceeb ntawm lub khob iav yog pob tshab iav, cov khoom siv nrog lub teeb xa hluav taws xob siab, siab refractive Performance index, thiab zoo tshuaj stability, cia lub trophy mus ci ntsa iab nyob rau hauv lub teeb. Nyob rau hauv cov nqe lus ntawm kev tsim cov txheej txheem, iav trophies feem ntau yog ua los ntawm kev sib xyaw ntawm cov tswv yim xws li tshuab, txiav, polishing, thiab engraving. Tshuab ua daim ntawv yooj yim ntawm cov khoom plig, thaum txiav thiab polishing tsim cov npoo du thiab cov kab ntws. Kev kos duab yog siv los kos cov ntawv, qauv, lossis lub logo rau saum npoo, txhim kho nws cov txiaj ntsig zoo nkauj thiab kev nco txog qhov tseem ceeb.
Lub khob iav yog ib qho khoom plig uas ua los ntawm cov iav pob tshab uas siv cov tswv yim tshwj xeeb, feem ntau yog siv los paub txog cov tib neeg lossis pab pawg uas tau ua tiav cov txiaj ntsig zoo hauv ntau yam.
