Электронный вольтметр + температурный датчик
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![Новая идея [Солнечная батарея] из светодиодной лампочки! Этого Неожидал Гений Лайфхаков.](https://sun9-7.userapi.com/N76SyrP-IzxWxde8nC9MqhX-PWxC155FfZvfXQ/UQz8K8de774.jpg)
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