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CANADUINO DCF77 Atomic Clock Receiver Module V3 77.5kHz for Europe
Commercial space Chip Scale Atomic Clock module is radiation tolerant
Miniature Atomic Clock (MAC - SA.3Xm) | Microsemi
WWVB 60kHz NIST Radio Controlled Clock Modules, 30dB High Gain Atomic Clock Receiver Module, 100mm Antenna 1.2 to 5V Operating Voltage for Radio/Radio Alarm Clock/Timer (5 PCS) | Walmart Canada
A combined MSF/DCF atomic clock receiver - ATMega32 AVR