The NJU9214 realizes high precision of 40,000 counts measurement by the NJRC original dual-slope A to D converter and realizes also quick response bargragh display and auto-ranging by another high speed dual-slope A to D converter. The input attenuator part is simplified because the resistor for resistance measurement is applied for voltage bleeder resistor. Furthermore, the NJU9214 realizes root-mean-square measurement for AC voltage and current by connecting a External RMS-DC Converter, and Data output by the on chip RS-232C interface circuit. The NJU9214 is suitable for high precision and high performance multimeter.