... to light sit interface.3.The parameters are divided A and B zone, very clear to display on the meter screen , so saving-energy how ... s convenient for external power source. Every lamp socket has a unique switch and mark, which is convenient for identification and control ... tester.Wiring:1,2 connect to DC9V~25V for testers power,3,4 connect to Load supply voltage,5,6 connect to load.Voltage range between ...