Adafruit PiRTC - Precise DS3231 Real Time Clock Module for Raspberry Pi RAM4GB Combine this with The Things

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Adafruit PiRTC - Precise DS3231 Real Time Clock Module for Raspberry Pi RAM4GB Combine this with The ThingsThis is the best battery backed real time clock (RTC) you can get that allows your Raspberry Pi project to keep track of time if the power is lost. Perfect for data logging, clock building, NTP servers, time stamping, timers and alarms, etc. Equipped with a genuine DS3231 RTC, it works great with the Raspberry Pi and has native kernel support. The datasheet for the DS3231 explains that this part is an "Extremely Accurate IC Integrated RTC TCXO