Raws li ib qho ntawm cov thawj coj hardness tester tuam ntxhab thiab cov muag khoom nyob rau hauv Suav teb, peb sov siab txais tos koj mus yuav cov qib siab hardness tester rau muag ntawm no los ntawm peb lub hoobkas. Tag nrho peb cov khoom yog nrog cov khoom zoo thiab cov nqi sib tw. Tiv tauj peb kom paub meej ntxiv.