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Many thanks to the "Erster Wiener Ruderclub Lia" (Austrian Junior Rowing Squad), check out their Instagram Profiles🇦🇹 [shared with permission]:
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Intro: When the Mi Band 6 was released, the performance of its health features were disappointing, especially its heart rate tracking. However, as we’ve seen for other devices, firmware updates can result in huge improvements. So, almost a year later, has the heart rate tracking of the Mi Band 6 improved? Well, that is what we will find out in this video, and to summarize, it actually seems like it might have improved quite significantly.
For those of you that are new to the channel, my name is Rob, and I am a postdoctoral scientist specializing in biological data analysis. For this video I wanted to do a comprehensive test of the Mi Band 6, so I bought a total of 3 Mi Band 6’s. I tested two Mi Band 6’s on myself, to be sure the results were not influenced by manufacturing variations between devices; and the third was tested by others, to see if results were any different when tested on other people.
First, we will very briefly recap how the Mi Band 6 performed when it was released. Second, we will look at the results of an extensive test I did of the Mi Band 6 in the end of 2021, where I tested it for more than 30 workouts. Third, we will check if the performance of the Mi Band 6 is consistently good when used by different individuals of the Austrian Junior Rowing Squad. And, fourth, we will look at the performance of a brand new Mi Band 6 that I bought this week. As you will see, it is this last test that is particularly confusing to me.

Conclusion: All in all, I think that these results look quite promising for the Mi Band 6. Most of the results I obtained are quite a lot better than the results I originally got for the Mi Band 6. Given the low price-tag of the Mi Band 6, it might be the right fit for people that are not looking to spend too much money on a heart rate tracker. However, there are a couple of things to keep in mind before buying the Mi Band 6: firstly, as you saw, I did get some conflicting results at the end of my testing, this could potentially mean there could be some variation in quality between different units that are produced. Second, I am not the biggest fan of the “Mi Wear” app, which was actually rebranded to the “Mi Fitness” app this week. It frequently had issues synching my data to other apps like Strava, so it was not the most reliable for me in that respect. Third, the Mi Band 7 is rumored to be released i n the next few months, so you might want to wait for my tests of that Smartband before buying the Mi Band 6. Though, also keep in mind that the Mi Band 7 might also need a couple of months to get a stable firmware version.

Timestamps:
00:00 Intro
01:45 Test 1
03:09 Test 2
06:29 Test 3
08:23 Test 4
10:01 My Interpretation