I have received the device and after a test with several windings (on FEV V2, Big Buddha, octopus) compared the resistors with an expensive professional monitor of a friend. If anything, there was now and then a deviation of 0.01 to 0.02 ohms, which is for winding friends to cope with absolutely the second decimal place is for "us" quite unimportant.
The other pole, unfortunately, I could not use and do not vote accordingly. Not because the machine was broken - it is already something, but because it wanted to just not interested and I meter was only looking for a cheap Ohm and not compare with professional appliances :)
