Digital Voltmeter Intelligent,High speed,High accuracy,High impedance,Auto,wide range,high reliability, With LCD screen ,RS-232 Digital ... speed,High accuracy,High impedanceAuto,wide range,high reliabilityWith LCD screen ,RS-232 availabl DF1934ADF1935 DF1934BDF1935B Range100μV~300V ... CH V,dB/dBm IndicationDigital,Model B with RS232Large LCD screenDigital,Model A with RS232 Size255×100×280 255 ...