tuning fork

You might have seen a tuning fork with a note and frequency marked on it.

She thought the original was like a tuning fork, but it didn't matter.

People would concentrate for hours on the pitch of a tuning fork.

Also built in are several effects and a touch sensitive digital tuning fork.

To properly fit the skin to the frame, a tuning fork had to be used.

The humming sound of the tuning fork could be heard when the watch was held to the ear.

He struck the tuning fork again and the leaves pressed away from one another.

Clara is also mentioned in the third book since she had the tuning fork.

"I can feel her trembling next to me, like she's a tuning fork."

I always thought a tuning fork was something you ate with.