Great device with errors!

Great device with errors!

ARM DSO203 NANO V2 / Quad Pocket Digital Oscilloscope With Aluminium Black Case (Electronics)
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Customer Review

The oscilloscope is well made, light and easy to transport.
For fast troubleshooting home or abroad well used.
It does not replace a "full scope" but charge you not to claim it!

However, I have a problem with the voltage calibration, after long trials I am not able to calibrate the oscilloscope.
If the instrument is calibrated according to instructions of the "zero point" in the range 10V to 2V plus, ie. it appears at a voltage of 30V 32V!
If the device is recalibrated and the zero and the gain is set to 0V, while not true of zero but the voltage value.
In short, the power indicator is not true, but so can I live
Trend view is Ok!
Would vote the voltage indication I would give 5 stars

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