It’s a sweet little gadget, good for measuring the USB port supply voltage and current being consumed by things plugged into the USB port (like my new Winbook TW700).

Even better, the price including delivery via China Post was about $3.50.

With this nifty gadget, I now know that my the Winbook (when on but completely charged) is pulling about 0.41 A.

I checked it with a load built out of 1% resistors and it seems pretty darned close. This should be in everyone’s toolbox.