Under and over voltage monitoring device

A Frind recommended me to add Under and over voltage monitoring device in my house main fuse box.

http://www.uriel-shay.com/media/upload/files/564006.pdf

Can it be a solution for mains problems and Without Negative sound influence ?

Thank you.

Once you have the information from the monitor, what will you do with it?

BadaBoom!

It’s not a monitor results.
You can adjust preferences for best protection as you think

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