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Any decent digital one should be able to do that I imagine. I've got an entry-level Siglent[1], it can do 1 microHz and up. Or am I missing something?

[1]: https://www.siglenteu.com/waveform-generators/sdg1000x-serie...

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Thanks. A lot of the hobbyist level ones did not do low frequencies at all or precisely enough to compare to electrical grid frequency

That one for 350 euros looks good

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