Smartwatches are useless for measuring actual stress levels, study says

A recently published study says there is "basically zero" correlation between data coming from wearable sensors and self-reported...

A recently published study says there is "basically zero" correlation between data coming from wearable sensors and self-reported stress levels. However, smartwatches and wearable gadgets aren't entirely useless if the user is well aware of the device's limitations.

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