Zoostliss Dual USB Charger Doctor Voltage Current Detector Digital Ammeter Voltmeter Multimeter USB Tester Mobile Power Panel Monitor Gauge Dc Display 3-9V 0-3A Red Blue LED Display Universal Usage! You can use it for almost everything about electronics with USB charging Maximum support 5A ,5A current (beyond 3A error will be larger in 3%). Application: Any mobile phone, any electronic product, can use, convenient operation, suitable for Measuring range: DC 3V-9V,Current: 0-3A (error: + 1%) This product can measure voltage USB power supply equipment, empty load, the voltage and current