... 96 two size digital voltmeter DU9 Single phase voltage meter / ampere meter with following features:Available for measuring voltage, current, active power ... two alarm function4-20mA current output, 0.5% FS accuracyModbus RTU, RS485 communication functionDU8 for 2 line display, DU9 for 3 ... sampling rate: 2 times/secondNotice:1. DU8 just for display,control, analog anf son on 7 parmeter disoplay, without ...