Deskripsi 6 in 1 Voltmeter - Ammeter 100A - Watt - Cos-phi - Frekuensi - kWh Feature: Can display voltage , current , power , power factor , energy and frequency at the same time Made of PC flam retardant material , which will be more safe for using ,Backlight control , short press to turn on/off backlight Hold press for 3 second to enter the over-load power setting , hold press for 5 second , system reset , cumulative capacity turns zero , overload power setting restore default value Voltage measurement range is AC 50-300V , current measurement range is 0.01-100A , frequency measurement range is 45-65Hz , energy measurement range is 0.01Wh-99999kWh The volt amp power energy frequency panel monitor is designed with built-in CT , no need to buy separately , powered by power grid directly(AC 220V) , no need external power supply.