Lub tuam txhab tau nruab nrog cov cuab yeej ntsuas qhov tseeb: Vernier calipers, hluav taws xob ntsuas, ntsuas ntsuas tuab, qhov cub, cov ntsuas viscosity, thiab cov tshuab ntsuas tensile yog siv los ntsuas ntau yam kev ua tau zoo ntawm cov hlua khi (viscosity, kua muag tsis kam, kub tsis kam, siab zog, elongation, thiab durability). Peb nruj me ntsis ua raws li 6 cov txheej txheem tshuaj xyuas: kev tshuaj xyuas cov khoom siv raw, tshuaj xyuas cov khoom tuaj, tshuaj xyuas online, tshuaj xyuas cov khoom tiav, kev tshuaj xyuas sab hauv, thiab kev tshuaj xyuas sab nraud, kom ntseeg tau tias cov khoom tiav tiav ntawm ntau dua 99%