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* [[Wellue]] (not recommended by [[User:DG|DG]] ([[User talk:DG|talk]]))
* [[Wellue]] (not recommended by [[User:DG|DG]] ([[User talk:DG|talk]]))
* The [[Biostrap]] is rather expensive ($400) but includes two heart rate sensors and many others.
* The [[Biostrap]] is rather expensive ($400) but includes two heart rate sensors and many others.
* [[Welltory]] <ref>https://welltory.com/heart-rate-variability/</ref> Can detect HRV when finger is placed in front of phone camera.
== Chest Straps ==
== Chest Straps ==