3.3" LED 4-Digit Red Display 3.5~7V 0~3A USB Power Charger Current Voltage Tester - Blue + Silver
LED display digit: 4; LED size: 3.3 inch; LED display color: Red; Detection range: Voltage: 3.5~7V; Current: 0~3A; Error: Voltage: less than +/- 1%; Current: Less than 2%. Compact and easy to carry no additional power supply plug and play; It can easily measure the output voltage of the USB port and the device operating current or load voltage.