Yes my function generator does work fine, as advertised. frank

Onyehn XR2206 High Precision Function Signal Generator DIY Kit Sine/Triangle/Square Output 1Hz-1MHz Adjustable Frequency Amplitude + Transparent Case Box Shell

Q: One of the left margin pictures shows displays of the function types. Can a display be added?

No, not from the device it's self. You would need a frequency counter and that type of circuit is not in this generator. What you see for a display is literature information only. It does not depict a circuit function for a display.

Q: Whta is the noise figure across the entire 1Hz - 1MHz (not the average) ?

That depends on the on the frequency you are trying to achieve and the components feeding the oculator .

Product ID: 557342232

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Onyehn XR2206 High Precision Function Signal Generator DIY Kit Sine/Triangle/Square Output 1Hz-1MHz Adjustable Frequency Amplitude + Transparent Case Box Shell