How sensitive are Oculus Quest 2 controllers?

I've always wanted to make a meditation VR experience. How sensitive are Quest 2 controllers? Could I use them to measure my breathing?

This proof of concept shows the variation in height when laying down with a controller laying one's chest. The left blue box represents the lowest position, green center is the current position of the controller, and the right red box is the maximum height is has reached.

While this shows the sensitivity is there, it's uncomfortable to lay on your back wearing a headset (with the elite battery strap, without using a pillow). The lower camera sensors can see the controller but it's not very good.

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