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by all2 2435 days ago
I've purchased this one: https://www.amazon.com/gp/product/B075F7NV56

I'm awaiting receipt.

I've been putting some thought into how I want to quantify outcomes; sleep, perceived energy levels / fatigue, ability to focus (not sure how to measure this). Nothing else has occurred to me yet.

If you had to measure, what would you choose to keep track of?