Ntau cov ntaub ntawv, tshwj xeeb tshaj yog cov khoom sib xyaw, tuaj yeem hnyav ib txhij nrog ntau lub taub hau hnyav. 16/18/20/ taub hau sib xyaw hnyav kuj tuaj yeem pab txhim kho kev ua haujlwm ntawm koj cov kab ntau lawm. Qhov zoo ntawm multihead weighter yog teev hauv qab no.

