The voltage measurement accuracy is outstanding, the current measurement good to very good, although the unit only from 50 mA indicating something, but where more than 70 mA flow. But we must not compare with traditional instruments, which take up the full scale 200 mV for themselves and therefore the tested device may be already undersupplied - here is far less "wasted" and that is also necessary, however, reduce the circuit tricks accuracy. After all, the error with increasing current is small and is in the range 200 mA to more than 1 A, only less than 5 mA (in my copy), when I was growing prefer my best device for reference - the rest of my multimeter scatter much more. Since there is nothing wrong.
The device is small, quite robust (although the inner workings of some wobbles), an additional micro-input jack allows you to determine power supply with soldered connectors (if necessary via an adapter) and the evaluation of (micro) USB cables with respect to its fast charging capability. A Better Way awesome is the simultaneous display of current and voltage, which saves a lot of fumbling, and the charge meter is at unattended charge mobilephones & Co indication of the consumed electricity and thus indirectly on the battery state, for even exist 10 memory locations. The display is illuminated decently and fairly easy to read despite the small size. When leaving a secure USB device voltage range, the indicator starts flashing.
The testing purposes operating with a USB 2.0 hard drive was smooth and without any restrictions of transfer rate in both directions.
One point deduction I give for not absolutely intuitive operation of a button: That one comes with a double-click in the selection mode of the memory and these can scroll, but the device Long press switches to the next memory and this clears immediately, you can also not understand a lot of experience.
Worth mentioning, however, is the German guide that is clearly arisen without Google Translator and shows a meaningful additional information about battery pack. Is that much power to have summarily for under 20 euros, are an additional point. Strong buy recommendation!
