20:54 for sale, brand-new and used.

AT&T RFG-RB 10MHz rubidium frequency standard with Efratom Rb oscillator and A.C. supply What you will receive is a fully tested and adjusted RFG RB 10Mhz rubidium frequency standard with a power cord. All you have to do is plug the unit into 100-240VAC, wait a few minutes and you’re ready to use the highly stable and accurate 10Mhz output to connect to your counter, synthesizer, etc., to replace the so-so internal oscillators that are in most of these units.

See list below for Lot D: This product has been stored in an ESD protective bag since purchased. Bolded numbers are sealed packaged from vendor/mfg.