Comment by mikewarot

10 MHz is the usual frequency that test equipment uses for external reference. If I could get more than one cheap enough I could do some very interesting home physics experiments.

For example, does time pass differently inside a can at a million volts potential relative to ground? Both positive and negative rate measurements.

What about inside a large "A" field at the heart of a large toroid?

I suppose I could trim them to the same frequency before the experiments, but still $1000 for hone lab experiments is out of my price range.