Volcraft dvm digital panel meters voltmeter modules voltcraft dvm330w the volcraft dvm 330w dc digital voltmeter module is a panel meter for installation in power supplies lab equipment control panels etc din dimension 72 x 36mm and 14mm digit height includes a led backlight for dark conditions with an additional current consumption of about 50ma virtually any measuring range may be achieved by simply adding resistors voltage divider shunt example electrical connection via solde