Activity from 2 devices

I wear my Fitbit Ionic daily, and wear a polar H7 strap when I am doing targeted exercises. My Fitbit is reporting activity calories for the day, and my Polar is reporting calories burnt during my exercise. Is this double dipping calories for said exercise, or does Cronometer automatically handle this? I can zero out the Polar, but I kinduf like having the timestamp available in my log.

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