It is a 2in1 Digital Tester/Dual display Digital Voltmeter Ammeter, Operating voltage:DC 4.5 ~ 30V, Measure Voltage Range: DC 0 ~ 100V, Measure Current Range: 2A (measure directly,built-in shunt), It has small size, high efficiency, long term stable and reliable quality,easy installation and use . Applications:Suitable for Charger, Auto,Electric bikes,motorcycles,inverter, solar energy, wind turbines, LED lights measurement or other products voltage current measurement.