... . Support USB connection and SD card ER9 Series Multi-function LCD Display Power Recorder Application1. ER9 power recorder is used to ... ect. It also can generates all kinds of forms .2. Datasheet record can be passed to PC to store or analysis ... system , intelligent switchboard , switch cabinet.Features1. 320*340 TFT color LCD display. 2. Measure 3 phase voltage , ampere , reactive power ,active ...