This tuner is great for an electric guitar. It is very easy to use and you can see the screen easily even in darker setting. If you don't know how to use it then you can read the instructions that come with it. With it came with its own 9v DC adapter though.
https://www.amazon.com/gp/aw/d/B075L8JCC1/ref=ya_aw_oh_bia_dp?ie=UTF8&psc=1
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