State of the art miniature atomic clock...

[Michael Katzmann]

This rubidium oscillator is 1.6" x 1.3" x 0.5" and uses just 120mW

https://ww1.microchip.com/downloads/aemDocuments/documents/FTD/ProductDocuments/Brochures/CSAC-SA65-Sell-Sheet-00003478.pdf
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