| LeapSecond.com Museum of Precise Time & Frequency |
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| HP Agilent 5071A Primary Frequency Standard (Cesium Beam) |
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| HP 5071A/001 S/N 119 measured against PHM |
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| HP 5071A/001 S/N 381 measured against PHM |
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| HP 5071A S/N 1078 measured against PHM |
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| HP 5071A #3 CBT ID: 3124A00412(S) measured against PHM |
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| HP 5071A #1 measured against PHM |
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