Digital AC 300V 50A Blue Lcd Dual Panel Volt Amp Combo Meter +CT Need No Power * Having a dual measurement of AC voltage, AC current with AC current transformer * It can measure AC 110V 220V 240V; Display Range (max) : 300V/50A (Please don"t exceed the 300V/50A) * It needes no extra working Power,the wires of CT can be extended as you want * It can be easily and Widely installed in the complex environment.