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Adafruit PCF8523 Real Time Clock Assembled Breakout Board : ID 3295 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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![ChronoDot - Ultra-precise Real Time Clock [v3] : ID 255 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/970x728/255-05.jpg "ChronoDot - Ultra-precise Real Time Clock [v3] : ID 255 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits")
ChronoDot - Ultra-precise Real Time Clock [v3] : ID 255 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Dallas DS1287 DS12887 DS12B887 BQ3287 OEC12C887 real time clock chip 386 486 RTC | eBay
