Litong 0.4" LED 4-Digit Red Display USB Power Charger Voltage Current Tester - (3~8V / 0~3A)
Available charging data transmission; Voltage current switching display; Measuring range is: DC 3~8V current: 0~3A error: 1%; Compact and easy to carry power free plug and play; It can easily measure output voltage of the USB port and the device operating current or load voltage