Practice Test How accurate are the readings really?

The gauge is meticulously crafted and makes a stable impression. The display is easy to read, the operation is very simple. All measure in all a very convenient device to voltage, current and capacity.

But now arises a question:
How accurate the readings of this device are truly? Can you trust this or is it just a cheap useless instrument?

This question can only be answered with a comparative measurement.
For this I have used a very expensive professional battery capacity tester. This device measures with 3 decimal points very precisely.

The results are clear:
This USB meter is very accurate and provides very good readings.

Compared:

USB meter: 5.04 volts
professional device: 4,95 Volt
Deviation: 0.09 volts

USB meter: 1.03 amps
professional device: 1.05 amps
Deviation: 0.02 amps

USB meter: 347 mAh
professional device: 347 mAh
Deviation: 0 mAh

Conclusion:
This affordable USB meter is really worth the money. Convince the measured values ​​and are comparable to the expensive reference unit. I am thrilled and can absolutely recommend this device.