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![Electricity [Grid] Frequency Meter](https://cdn.xingosoftware.com/elektor/images/fetch/dpr_1,w_379,h_200,c_fit/https%3A%2F%2Fwww.elektormagazine.com%2Fassets%2Fupload%2Fimg%2Fpublic%2Foriginal%2Fimg20150602193201-sml-0.jpg)