Ụlọ ọrụ na-eduga na nnwale na ị na-eji ngwa na mita.
Dobere na 2006, ọ bụ ụlọ ọrụ dị elu raara onwe ya nye na nyocha, mmepụta na ahịa nke nnwale na ngwa ọrụ mmepụta ihe.
Metroike na-ekwusi ike na freshọpụtara onwe ha, wee mepụta ma mepụta iwu nchekwa, iwu nchekwa ahụike,Ultra-elu voltaji na-asọpụta nkpota voltaji, Dijitalụ dị elu-voltaji, DC na-eguzogide na-eguzogide, Mita nwere ikike (mita ike), Ngwongwo ikike, NaNa-agbanyụ ọkụ.