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I have a Mio Link – a sports wristband that can measure heart rate at the wrist and transfer it to a mobile phone or sports watch – and I got a heart rate monitor (HRM) belt that came with my Ambit3R watch. I would like to know if it is possible to use both heart rate sensors at the same time to record them with the Ambit3R watch and verify that they measure similar heart rates? I did a test run with the watch, and according to the results I viewed in the movescount app it appears to measure only with a single HRM.

  • I added a product link, let me know if that's not the right one :) I have a fitbit so I just picked the first Mio Link Google threw at me ;) – Aravona Feb 18 '16 at 13:23
  • @Aravona Yes, that's it. It is much more comfortable than a belt, I can compare now. :-) I was not able to test the accuracy yet, that's why I asked this question. Btw. I sent the same question to Suunto support, maybe they have an answer. – inf3rno Feb 18 '16 at 14:13
  • if they do it'll be awesome if you can self answer with what they say. – Aravona Feb 18 '16 at 14:51
  • I guess you mean using two heart rate monitors at the same time, i.e. within the same activity, right? – Benedikt Bauer Feb 18 '16 at 15:08
  • @BenediktBauer Yes. So I could compare them. Since Mio Link measures on the wrist, I am not sure how accurate it is compared to a chest strap. – inf3rno Feb 18 '16 at 15:13
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While it surely is possible to pair the watch with several HR monitoring devices, I don't think it's possible to use more than one at the same time. I cannot tell for sure since I don't have an Ambit3 (which uses the Bluetooth Low Energy protocol to connect external sensors, as far as I remember) but only an Ambit2 (which communicates via ANT+) but in the case of my watch it stops searching for a certain type of external sensor as soon as it has detected one it was paired with.

Technically, it would surely be possible to use more than one sensor of the same type at a time, however that imposes a lot of extra stuff to handle:

The watch needs a logic to handle two data sources of the same type that quite surely will deliver slightly different signals. That means, if you ask it to show "heart rate", what should it display? The signal from source 1 or source 2? The average of both? Should all the measurements that are derived from the heart rate (average heart rate, times in certain zones etc.) also be handled for both sources? Should both of them be recorded in full? All this on a device that has limited battery and storage capacity and computation power.

These thoughts make it quite improbable that such a functionality has been (or will be) implemented by Suunto, since its use case is very limited and the possible issues coming with it are rather significant.

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  • Interesting. I wait Suunto's answer to confirm this, but I suspect so too. I might be able to verify the HR monitors with a BLE - USB adapter, my PC, and some programming. So I can surely leave out the watch from the equation. I checked the BLE GATT services of Windows 8.1 with my tablet, I did not like it. Maybe there is a better API on Linux. I'll try it out, as soon as I bought a BLE - USB adapter. Another possible solution would be to record two exercises on the same track with similar pace but different HR sensors, and compare the results after that. – inf3rno Feb 18 '16 at 16:51

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