Ua rau: Tsis tsim nyog teeb tsa ntawm vuam tsis xws li vuam tam sim no, voltage, thiab ceev.
Kev daws: Teem vuam tsis tsim nyog raws li cov khoom siv vuam thiab cov lus qhia tshwj xeeb; tsis tu ncua calibrate thiab tshuaj xyuas cov khoom siv vuam kom paub meej qhov ntsuas qhov tseeb.
