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Adafruit DS3231 Precision RTC - STEMMA QT : ID 5188 : $13.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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WINGONEER 5PCS DS3231 Precision RTC Clock Module Memory Module for Arduino for Raspberry Pi - Newegg.com
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Amazon.com: Clock & Timer Development Tools Adafruit DS3231 Precision RTC Breakout : Industrial & Scientific
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