... LCD Display Power Recorder Application1. ER9 power recorder is used to measure and record true value of 3 phase voltage , ampere , active power , reactive power , power factor ... .Features1. 320*340 TFT color LCD display. 2. Measure 3 phase voltage , ampere , reactive power ,active power , apparent power , power factor , frequency , Kwh , KvarH ect3. Total ...