Ua rau peb mus txog cov khoom: cov tester kev ntsuas kev tswj hwm ntawm cov khoom, qhov chaw leej twg uas pab peb ntsuas qhov ntev — lossis qhov tsis ntev — ntawm cov dej, tshwj xeeb yog nyob rau hauv qhov kev tsim khoom. Nws yog qhov tseem ceeb rau kev ntsuas cov khoom zoo li plastic thiab polymer. Thaum peb siv cov khoom no, peb xav paub tias lawv yuav ua dab tsi thaum peb sau lawv los yog khi lawv. Qhov saum toj no yog qhov cov tester kev ntsuas kev tswj hwm ntawm cov khoom tau pab peb paub, uas tau ntsuas qhov dej yuav khi los ntawm qhov tub ntev. Qhov kev ntsuas no pab cov tuam tshab kom paub tias cov khoom uas lawv tsim yog zoo. Peb paub tias qhov kev ntsuas no yog tseem ceeb heev Viscometers rau kev ntsuas nyob rau ZONWON. Peb nyob no kom paub tias kev tsim khoom ntawm lawv yog raug thiab muaj txiaj ntsig.