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Don't know how low but I just checked and mine at 93%. It says it will go to 80% but never been below 93%.
Sorry, there was a problem. Please try again later.Hi, there. Fitbit does not measure or display SpO2 values below 80 percent. For more information, please visit this: https://store.google.com/intl/en/ideas/articles/track-your-spo2/ For any additional questions and concerns, reach us at: https://goo.gle/contactfitbit
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