Raws li cov qauv kev lees paub thoob ntiaj teb, cov khoom siv iav thiab iav siv nyob rau hauv cov chaw soj nstuam feem ntau tau muab faib ua yim pawg hauv qab no: (1) Kev thauj mus los thiab kev cuam tshuam cov khoom siv: suav nrog cov iav pob qij txha, qhov sib txuas, li qub, plugs, raj, rods, thiab lwm yam. (2) Ntim : xws li cov tais diav, lub raj mis, beakers, flasks, tanks, test tubes, etc. (3) Basic operating instruments and devices: Piv txwv li, rau