1. LED/LCD display. 2. High quality and high accuracy. 3. Good operation functions. Model: YD4E-9S4Function1). Measurement: U, I, P, Q, PF, F, EP all power parameter.2). Class: active power 0.5 class; reactive power 1 class.3). Display: Three rows of 12Bit high light LED display,Intelligent PID control.4). Power impulse output; two circuits.5). Standard RS485 communication interface, support ...