Vectron, a Knowles company, offers the OX-208 high stability ovenized crystal oscillator designed to be capable of aging rates of 0.15 ppb/day, and temperature stabilities of 0.8 ppb over an industrial temperature range. Operating at a frequency range of 5 to 20 MHz, this oscillator is ideal for holdover referencing, test equipment, synthesizers, military communication equipment, and digital switching.