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  1. L

    Good, cheap protein on Amazon and a heart rate monitor that actually works and doesn’t cost $500?

    @nothingtoknow They work by different mechanisms and a tattoo wouldn’t confuse the chest strap. The wrist uses an optical sensor to look at rate of blood pulsation under the skin essentially (which is readily obscured by tattoo ink) whereas the chest straps actually detect electrical output from...
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