SRS (Stanford Research System) FS 725 reference clock, 10 MHz, 5 MHz rubidium frequency standard

See my 20 years of extensive, perfect feedback and buy with confidence. I have sold a LOT of stuff over the years and rate things conservatively. 
laboratory grade frequency generator for your DAC, switch, word clock, etc that will accept a master input. You can pay thousands more for a so called "audiophile" clock or get this precision instrument for much less.
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