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It's a battery meter. solar.lowtechmagazine.com is a solar-powered website. https://solar.lowtechmagazine.com/about.html https://solar.lowtechmagazine.com/abou
by oftenwrong 5y ago
It's a battery meter. solar.lowtechmagazine.com is a solar-powered website.
https://solar.lowtechmagazine.com/about.html https://solar.lowtechmagazine.com/about.html