By the end of the video, the GPS oscillator never totally locked with the rubidium standard, although they were close. However, there is no way to know which of them was further off the actual 10 ...

A study led by Russia’s Skoltech and China’s HPSTAR suggests that rubidium and cesium additives could improve the efficiency of hydrogen batteries. Researcher Dmitrii Semenok tells pv magazine ...

We think of crystals as the gold standard of frequency generation ... [W3AXL] picked up a rubidium reference oscillator on eBay at a low cost, and he shows us how it works in the video you ...