The GPS-88 (GPS-OCXO) from Pendulum Instruments is a Time and Frequency Standard with Frequency 0.1 MHz / 5 MHz / 10 MHz, Stability over Temperature 2.5 ppb, Phase Noise -135 to -100 dBc/Hz, Short Term Stability 300 to 5000 ppb. Tags: Benchtop, Frequency Standard. More details for GPS-88 (GPS-OCXO) can be seen below.