At AliExpress, we bend the laws of physica

[Udi Finkelstein]

http://szqiansheng.en.alibaba.com/product/1918689271-217023912/usb_Digital_Current_Meter_Voltage_tester.html

or more specifically:

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Tell Kirchhoff his current law sucks. (in our wires, current get lower as
it gets to the wire's end).

Seriously, at first I thought it was just a testimony's to the product's
horrible accuracy.
It took me a while to realize that after all, the LEDs on each module *do*
take some power, so some of it is lost in a direct vcc->gnd path within
each dongle.
still, with left_dongle - middle_dongle = 50mA and middle_dongle -
right_dongle = 10ma, it doesn't really gives me much confidence in this
product.

Udi