Voltmeter wānana

Wanana voltmeter, kūpono no ke keʻena hoʻokolohua kula e ana i ka uila ma DC circut, e hōʻike me ka papahana.– Me ke kaapuni pale o ka diode silikona ma ka lole mika, me ka ʻole o ka poino keu–Fle scale scale pono o?