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DS3231 Mini RTC Module for Raspberry Pi & Arduino [DS3231] - US $2.50 : HAOYU Electronics : Make Engineers Job Easier
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Ds3231 High Precision Rtc Real Time Clock Module 3.3V/5V for Arduino Raspberry Pi - China PCB, PCB Assembly | Made-in-China.com
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Adafruit PiRTC - Precise DS3231 Real Time Clock for Raspberry Pi : ID 4282 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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