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Any PC works on 5v logic voltage. So you have to make sure the input amplitude should not cross 5v. If you are working on circuit with high voltage, use a high value resistors of 1K to 1M ohm, as required. A high value potentiometer can help you to adjust the amplitude.
Yes. Mic-in is only needed... Make sure you have the audio drivers installed in your PC and it detects the mic port.
They have mentioned in their site to use 1 volt as input. Please go through these FAQ... https://www.zelscope.com/faq.html