... output: Alarm, RS485 DP4-RMS Digital Ammeter/Voltmeter series are intelligent digital power meter, designed as high quality and performance, adopts modern advanced SMT technology ... quality and performance ammeter, voltmeter, current meter, voltage meter, power meter, pannel meter, ohmmeter, high-impendence ohmmeter DP4-RMS Intelligent Digital DC/AC Ammeter/Volmeter ...