Comment by OhMeadhbh

4 days ago

Sure, but F2 is a bit more accurate: "As of February 2016 the IT-CsF2 cesium fountain clock started reporting a uB of 1.7 × 10−16 in the BIPM reports of evaluation of primary frequency standards." ( from https://web.archive.org/web/20220121090046/ftp://ftp2.bipm.o... )

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