Rubidium Frequency References have long been established as one of the world's most cost effective atomic clock solutions where an independent and highly accurate frequency reference is required.

The range of Valpey Fisher's Rubidium instruments includes units with outstanding phase noise and short-term stability for demanding metrology applications, to lower cost units providing excellent long term performance at low cost for many applications such as telecommunications synchronization and
portable reference sources.

Additional options, such as external or internal disciplining to a highly stable long-term reference, such as GPS, extend the usefulness of these devices to become low cost alternatives to the more expensive cesium atomic clock solution.