Tsinkaya Voltmeter

Tsinkaya voltmeter, ya dace da dakin gwaje-gwaje na makaranta don auna ƙarfin lantarki a cikin da'irar DC, don nunawa tare da majigi.–Tare da kariya ta silikon diode akan kayan mitar, kyauta daga lalacewar obalodi–Cikakkiyar sikelin daidai?