Engineers also use the vibration of the bars, for instance in measuring instruments made to measure frequency.

We can see a microchip in the picture, on which there are a lot of bars of different sizes. When the chip oscillates only the bar with a self-frequency - due to its size - similar to that of the chip will start oscillating, this way measuring the value of the given frequency. The oscillation of the appropriate bar can be observed visually and electrically as well.