Readings present the helpful voltage determined by the typical worth of samples over a whole amount of durations of the elemental frequencyK?t Qu? X? S? K?t Qu? X? S? Mi?n Nam K?t Qu? X? S? Mi?n Trung K?t Qu? X? S? Mi?n B?c KQXS Các T?nh KQXS ?i?n Toán X? s? ?i?n toán Mega 6/45 X? s? ?i?n toán Energy 6/fifty five X? s? ?i?n toán Max3D Professi