Meter yog qhov ntsuas, tseem hu ua hluav taws kub ntsuas. Thaum siv lub ntsuas hluav taws xob yuav tsum tau ceev faj, nyob rau hauv qhov tsis tshua muaj hluav taws xob thiab tam sim no, lub ntsuas hluav taws xob tuaj yeem nkag mus rau hauv Circuit Court. Tab sis nyob rau hauv high voltage los yog siab tam sim no, lub 'meter' yuav tsum tau siv nrog lub voltage transformer los yog tam sim no transformer. Kev nkag ncaj qha mus rau lub 'meter', tus nqi thauj khoom ntawm hluav taws xob hauv nws qhov kev ntsuas ntau dua 10 feem pua, txwv tsis pub qhov ntsuas yuav tsis raug. Raws li qhov xwm txheej ntawm kev nkag mus rau lub zog tuaj yeem muab faib ua DC thiab AC. Muab faib los ntawm cov khoom siv hluav taws xob rau hauv peb-theem meter (peb-theem peb-theem thiab peb-theem plaub-xaim) thiab ib-theem meter. Tsev neeg feem ntau yog ib-theem watt-teev meter, qhov ntsuas hluav taws xob yog 220V. Cov qauv ntsuas tam sim no txawv. Raws li lub hauv paus ntsiab lus tuaj yeem muab faib ua induction thiab hluav taws xob. Induction watt-teev meter ntau lawm yuav tsum siab dua, koj tuaj yeem siv ntau yam ntaub ntawv. Kev tsim hluav taws xob watt-teev meters qis dua li ntawm inductive watt-teev meters, tab sis nws qhia tau hais tias muaj kev nce siab sai.
Hauv kev yuav khoom ntawm lub 'meter' yuav tsum tau them sai sai rau, ib qho yog qhov zoo ntawm qhov teeb meem, lub 'meter' tuaj yeem ua los ntawm ntau yam khoom siv, muaj lub sijhawm zoo, qee qhov ntsuas yuav pheej yig heev, tab sis kuj txhais tau tias cov ntaub ntawv tsim tawm tuaj yeem ua tau. yuav pluag heev, yog li pheej yig heev yuav tsis zoo. Tom qab ntawd muaj kev yuav khoom ntawm watt-teev meter yuav tsum tau them sai sai rau lub zog, txhawm rau suav tag nrho lub zog ntawm tag nrho cov khoom siv hauv tsev yog tus naj npawb ntawm cov xaiv watt-teev meter fais fab ntau dua li txhua yam khoom siv ntxiv rau lub zog ntau dua.