SKU: OT2005-A102 Article number: NA477 EAN: 4039433334198
A handy USB power tester from the brand Keweisi and the type KWS-V20.
You can see, among other things, the voltage and the number of A.
Useful for gaining insight into what a USB device consumes, but also whether, for example, with an Arduino or ESP8266 you are demanding too much from your USB port (or receiving too little for, for example, your relay).
Voltage: 4-20V +/- 1%
Load: 0-3A +/- 1%
Dimensions
Length: 7.3cm
Width: 2.5cm
Height: 1.35cm