Arduino readable non-contact voltage detector (looking to buy, not make)

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we're making robot needs have voltage detector electrified surfaces. tried making noncontact voltage detector ourselves , weren't satisfied quality of produced. we're looking commercial design can feed data arduino minimal hardware hacking.  it'd nice if simple analog value read off single pin.

any suggestions?

how, exactly, these surfaces "electrified" , requirements voltage range, voltage source frequency , accuracy?


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