Mi Band 9: Scientific Review

[@TheQuantifiedScientist]

▬▬▬▬▬▬▬▬▬▬👇DISCOUNTS/AFFILIATES!👇▬▬▬▬▬▬▬▬▬▬ 🔴 Best place to get a Mi Band 9 * ;-) : geni.us/MiBand9_TQS 🔴 Whoop Strap 4.0: join.whoop.com/QuantifiedScientist ($30 off any new WHOOP membership) 🔴 Eight sleep 350$/200$ (€) discount*: eight-sleep.ioym.net/TheQuantifiedScientist + add code “UNBOXTHERAPY” or “TQS” for full discount 🔴 Oura Ring Link: I recommend you search for a discount on reddit with the "Refer-A-Friend" program! If you can’t find one: ouraring.sjv.io/rQ4L33 (affiliate link that supports the channel, but doesn't have a discount) 🔴 General Amazon link*: geni.us/thequantifiedscientist ☝Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!☝ 🟢 Instagram: instagram.com/quantified_scientist/ 🟠 Shorts: www.youtube.com/@smartwatchshorts 🔵 Newsletter: www.robterhorst.com 🟡 Twitter: @QuantifiedRob * Affiliate (paid) links support the channel by earning me a commission on any sale, and it doesn't cost you any more! My opinions are completely my own, and this content is not sponsored. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 📸My Gear* (paid links, supports the channel and doesn’t cost you any more)📸 Camera body (main): geni.us/SonyA6600_body Camera lens (main): geni.us/SigmaContemporary Camera (B-roll 1): geni.us/Sony_ZVE1 Camera (B-roll 2): geni.us/CanonEosM50MarkII and geni.us/Sony_ZVE10 Light: geni.us/Godox_VL150 Softbox: geni.us/NiceFotoSoftbox Light stand: geni.us/WalimexLightstand ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

[@aaakmm1785]

I am so glad that you included "walking outside" activity. It should be included in all your reviews for people that are less sport oriented but still want to track simpler activities.

[@ripxrip]

Agree. Walking is my preferred cardio.

[@jayshukla4926]

Fully agreed.

[@user-ij8no5zw6u-]

Yes, I hope so as well! Walking is easy, but as we can see not that easy for many devices.

[@JanZamani]

Agreed! Walking outside and inside (treadmill) is my main form of exercise. Maybe a short amount of weightlifting which is not even worth tracking. Walking, sleeping, resting (or background) heartrate, maybe sleeping SPO2 are the most important metrics for me to track.

[@TheQuantifiedScientist]

Thanks for sharing that input!

[@ItsNicolau]

Xiaomi always states that they update the sensors and algorithms and that the accuracy increases by a double-digit percentage, but every year, the results are more or less the same. It's a little disappointing. Thank you, Rob, for doing these reviews! You're amazing. Take care!

[@TheQuantifiedScientist]

Thanks Nicolau!

[@Blu3_777]

Question what's the importance of the heart rate accuracy and what does heart rate determine?

[@trym2121]

​@@Blu3_777 if you have a serious disease it can determine whether you stop activity or keep going and go straight to ICU Of course, people with such condition won't use unreliable cheap Chinese health trackers. Heart rate, Huawei is decent but Apple is still the king

[@malikulamin9948]

@@Blu3_777 its estimate your calories and heart rate

[@bautifas6610]

imagine if you have a 1% margin of error and you improve it by 10%, you would have 0,9% margin of error, thats why it doesnt change much

[@Marllon_333]

*Finally, I was really waiting for this review!* 😁

[@arnolfinilmf]

Mee too! ✌️

[@TheQuantifiedScientist]

You're welcome!

[@eduardg5619]

Waiting now for the review of the PRO model ❤

[@Marllon_333]

​@@TheQuantifiedScientist😁

[@nicholas4975]

FINALLY, the mi band 9 scientific review after so many months!

[@p.a.2712]

Been waiting for this review for months! Thank goodness!

[@MohammadEllepaikhan]

You’ve helped me a lot, thank you for your reviews. You’re the best.

[@TheQuantifiedScientist]

Happy to hear that!

[@mkriiger]

The best test on KZbin, as usual. Thanks for the amazing work.

[@Gamerglotzer]

That is real dedication! Even testing Smartwatches during travelling and work. Thanks Rob for your effort!

[@CarotenCake]

Thanks you're realy doing a great job, best tests i've seen so far

[@TheQuantifiedScientist]

Thanks!

[@arnolfinilmf]

I had my first Mi Band 4 for 3 years and today I have a Miband 7 and a Huawei GT Pro 3. I have to confess that despite knowing that the Mi Band is crap, it attracts me a lot. I love the simplicity, the design and the more than two weeks of battery life. For me, it is practical, cheap and everything I need for my day to day life. I am considering buying a Pixel 4 in the future because I live alone and it has some security features that I find very relevant. Other than that, I continue with my Mi Band.

[@TheQuantifiedScientist]

Thanks for sharing!

[@adaninurs]

my huawei band 8 last a LONG time too! absolutely love the battery life!

[@googlekullancs564]

honestly, for me it's more than enough. correlation rate being above 0.8 all the time is enough for 50 dollars. I'm impressed.

[@ItsNicolau]

Let's go! I have been waiting for this for weeks! You're the man, Rob, thanks!

[@Spacemonkeymojo]

Been waiting for this video for a while now! Thanks Rob, and I'm sorry to hear about your breakup.

[@main-iq9jx]

Thank you so much! your types of tests are so important to divide the companies that are actually trying to make a good device vs companies that give you minimum effort for your money. And these 50$ devices seem to be the most sold products since so many people can afford them

[@gwendolynveronica]

I'm always so excited to get notified about your new videos on MiBands! I've had the MiBands 7, 8, and 9. I didn't use them much for exercise tracking, mostly as a general tracker for my sleep, since I used to have some issues. Honestly, I did have a very good experience with the 7 tracking my sleep. It felt like it caught my wake-ups within the minute. I decided to upgrade to the 8, and frequently found it recording I was asleep 20 minutes past the time I had actually woken up. I was seriously disappointed, and waited eagerly for the 9. I'm now finally wearing the 9, and I absolutely feel it is an improvement from the 8, but it does not compare to the 7. I'm always hoping for software updates to come around to improve the sleep tracking, but I'm always disappointed. Your sleep data just about perfectly reflects my personal experience with the Mi Bands. I've just ordered the 9 Pro, I'm hoping it'll be better. Please do a video on the 9 Pro too!

[@GiuseppeSavo]

well... now the question is "how can be a device like this one worse in walking than in running?!?".

[@RedPanda_00806]

+1

[@TheQuantifiedScientist]

I don't understand it either...

[@petrovsk]

I think that the reason for this is : when tracking an intense activity, the sensor takes more readings, with more processing to for a reliable good reading, while when you're walking (less intense activity), xiaomi wants to save power/energy, using less readings and processing, making the data less reliable

[@stureericsson9545]

You best have it set to take the heart rate at one minute intervalls(or does smart interval take take h.r.more frequent during more intense movements?(i.e.&exercise wirh higher heart rates?).

[@muhwyndham]

My best bet as a software engineer is that their HR tracking is not always turned on but turned on based on event. The event that they tracks is using proximity sensor deviation. In walking, the deviation is considerably smaller (you swing your hand less and your body bounce less) so there's possibility that there's less event to trigger the HR tracking, resulting in not so good details (like highs and lows), but maybe acceptable average.

[@B6ka]

Thank you, indoor performance seems quite good. I have been using Mi Band for 1.5 years, not bad for heart rate measurement and keeping track of exercises. It is also good that I do not have to pay subscription fees on analytics and charge it once per week only or so.

[@mattycatteddu4422]

I just discovered your channel and it a goldmine. Thank you so much for your hardwork! 🙏🏼🙏🏼 You helped in guiding me to find the correct watch for Xmas for my mom. The walking test is really important, please please please keep including it.

[@francescosavignano8542]

Since the miband 9 came out i couldn't wait to watch your video about it! Good work!

[@joaomoreira7251]

You're such a great guy man, wish all the best buddy, hoping to see t rex 3 here.

[@Dparrey]

Just amazing content provided for free. I love the balanced opinions given the price of the device. I mostly got one as a light smart watch (music messages time etc) and some basic hr monitoring and total sleep is a nice bonus.

[@Brandencarroll1]

I'm dying to see your Oura Ring 4 review!!

[@piterpan2205]

what do you think about xiaomi watch 2 or 2 pro or band 9 pro, maybe you tested?

[@_icscata_]

Great review, Rob! Your reviews are extremely detailed and this is awesome! 👏🏻👏🏻

[@SillyMonkeysLikeApples]

last year I got a huawei band 8 because it was the most accurate heart track for as cheap as one can get, and I dont regret it at all, its great and works perfect, I really appreciate all the data you bring us and all the time you spend on this, if there is a way I can donate some money let us know please, just as a token of appreciation on saving us time and money on making the right purchase right off the bat

[@ReligionAndMaterialismDebunked]

Nice. Shalom.

[@Marta1Buck]

my huawei band 6 just died today, time to upgrade, I guess.

[@SillyMonkeysLikeApples]

@@Marta1Buck well, it lasted quite a few years at least? mine being 50 bucks I hope it last over 2 years, 25 a year isnt that bad

[@michaelcorcoran8768]

One thing that's cool about these is that after 6 months or 9 months or whatever even 12 months you can get them for $0.50 on that dollar. 25 30 bucks sometimes

[@radieschen79]

Yep, they are crazy cheap on AliExpress.

[@marccometa112]

Thanks for this ! Patiently waiting fo rthe Mi Band 9 pro review

[@michelet.5602]

Me too, let's hope he does it soon

[@ethansutio7577]

Haven’t seen any reviews for the Oura ring 4! I’d love to watch one from you!

[@mathiasjunnielsen]

And Ultrahuman and RingConn!

[@Md.Al-ShahriarNafiz]

Lets gooo bro🎉 i was waiting for this video from last 2 months❤ love you bro. Love from Bangladesh 🇧🇩

[@MrMorton]

Impressive improvement for this tracker. Had a much older one (Mi5) and loved the battery life. Is the app any better? I'm impressed with how many devices you wear at one time! 😂. Thanks Rob for all your effort!

[@TheQuantifiedScientist]

Thanks! The app is OK, but definitely nothing special. And thanks for becoming a member :-)

[@nunjabizness]

Nice video! Can we expect to see a review of the Xiaomi Smart Band 9 Pro? I think it uses a different sensor (layout).

[@iTooob]

You should upload the charts online to a website of yours and even, if possible, make them interactive! Awesome videos.

[@Raivo_K]

Bought one about a month ago when the glass on my Band 4 eventually broke and rendered it unusable. I obviously bought it for price and battery longevity. Not so much for accuracy. Few remarks on the device overall: i like the much slimmer/flatter profile compared to earlier Mi Band devices. Also the metal shell seems to make it more durable. The screen is significantly improved in both the brightness, resolution, size and refresh rate. The bad thing is that the default wrist rest is still the same silicone one. From my experience from Band 4 i can tell that this will break apart in a year forcing me to buy a new wrist rest to replace it. Battery lasts just about 7 days like i want with maxed out brightness, heart rate, blood oxygen and heart rate monitoring. I disabled the stress monitoring as it seemed pretty useless. First few days after charging the battery quickly loses 20-30% of the charge but holds up very well in the 70-20% range. Below 20% it again starts draining quicker and offers to enable battery saver at 5%. This is with five days of nighttime outdoor walking (about 8km) and two 40 minute weight lifting sessions in a week. So far im happy and it's a clear upgrade from my old Band 4 model.

[@mathiasjunnielsen]

Can we get a test of more smart rings? I would love to see Oura Ring 4, Ultrahuman and Ringconn 2 ❤

[@OMGitsBababoey]

Thank you for all the content! But please take care of yourself! I know how hard it can be to juggle life + youtube!

[@TheQuantifiedScientist]

I appreciate it!

[@Francoargentin83]

Thanks for the hard work!

[@Xearrik]

So what you're saying is if I want the Mi Band 9 to be as accurate as possible, I'll need to wear a wristband over it during the day to block out the light?

[@radieschen79]

Good idea👍

[@brunoteixeira4301]

Thank you very much. Put the Xiaomi S4 on your future review list🙌

[@Joewnny]

huawei band 9 or xiaomi mi band 9 for sleep tracking and heart rate accuracy?

[@donovanguthrie8958]

Thanks for all the reviews! PLEASE keep the walking tests...so important to people my age...

[@danishidqi]

Before testing, have you updated the mb9 firmware to the latest version because the previous version had many bugs? I like your YT channel, thank you.

[@MikhailKukuyev]

Thank you for your effort, time and visualization of analyzed data! You channel is a gem! Can you please also test Xiaomi Smart Band 8/9 Pro? I am curious if it also has issues with HR tracker.

[@minhajulabedinjoy2806]

At 0:02 , are the Midnight Black and Titan Grey editions of Mi Band 9? I get confused between the Glacier Silver and Titan Grey, someone help me☺️

[@-ross-7250]

❤ love the videos. Please do the Amazfit Trex 3 🙏🙏

[@quadcorei8085gen2]

General question. Did you take into account the variation or error of the polar H10 or this is not filtered and shows up as deviation/disagreement?

[@talhasoylu898]

Which is better? Galaxy fit 3 vs mi band 9… i am so confused

[@nimarezaei3167]

If you have a Galaxy phone, I highly recommend the Fit3, as it is similar to watches.

[@NostalgicMem0ries]

galaxy fit 3 is way better, but dont match mi band battery life. i get 5 6 days at best. but hr is really accurate

[@abdullahalamin1263]

Hey man. Really love your in-depth analysis using statistical graphs. I am confused between the Amazfit Balance and Amazfit T-Rex 3. Which one has the more accurate tracking overall?

[@idleprepress]

AWesome! Any plans for the pro version review?

[@quadcorei8085gen2]

Thanks for all these measurements. I just wanted to order something quick to check my pulse throughout the day and stumbled into your channel. One suggestion maybe instead of R=0.95% you could change the display of this value to 95% (as an engineer I do not have an issue with any format but for the average watcher it is more consumable AND you won't have to repeat that "correlation higher than 1.00 is not possible"). Greetings from Vienna :)

[@SimoneDoyle-e8t]

Love your vids. When will you be creating a vid on the Oura Ring 4?

[@MariaSilva-hq7fh]

We want the oura ring 4! 👋🏽

[@theotherleft6113]

Great review. Are you left handed by chance? You've done a few reviews with bands on both wrists. I wonder if your left wrist is more muscular/bigger leading to better sensor readings.

[@lyricsremix7884]

So the Huawei wearables are the best in the budget category, right?

[@quadcorei8085gen2]

I ordered one and found that the HR tracking was pretty bad, sent it back, but could not find anything better so after wathcing your video I ordered another and found that the armbands are replacable, so ordered nylon and now it sits well on my wrists and no hiccups. Every time i cross checked it with another pulse measuring device it showed the same. Imo the original TPU bands are a bit stiff and the adjustment holes not good the strap is either too loose or too tight, i would guess this is what you also saw on your records.

[@JohnoEx]

is your mi band 9 pro review coming?

[@ermeriodsassperini]

When will you be doing a review on the oura ring 4?

[@mathiasjunnielsen]

And Ultrahuman and Ringconn!

[@prohooperlive]

Perfect review! Appreciated! How about band 9 pro?

[@Androide323]

Hey there, do you have anything available that we can check for a detailed database of all the watches you've tested? Like the best watches for each category so we can make an easier choice when we buy...

[@EricA0321]

Have you looked in to the new HUWAEI WATCH D2 that monitors your dia and sys?

[@drysun9658]

Great Video. The two watches and then a scatter plot as well! Fantastic 😍 Wonder if biology is the reason for the left/right comparison or variance in sensor productions ...

[@pinksun7305]

I just realized that for me, mi band is the most comfortable device, and in time this tops all the limitations of this device...

[@Legenwait4itdary]

can you test sleep as android combined with polar variety sense and how it compares to nukkuaa? Its free and would be the perfect setup!

[@GorZic]

Great review! Please also test the Redmi Watch 5 Lite!

[@kaynejk9629]

How would this compare to the Huawei band 9 ? Also I know the garmin vivosmart 5 is 2 years old .. it’s priced quite well right now.. similar range.. also any idea when the vivosmart 6 would be coming out ?

[@quiaudet3298]

The Huawei Band 9 is definitely much better. You can see the measurements for the Huawei Band 9 (left) in the diagrams. In most cases, the Huawei Band performs better. I personally own both devices, and while the Xiaomi has a faster CPU, better display, and more responsive touch, the Huawei Band has superior sensors and software that makes much more of your measurements than the Xiaomi Band. Additionally, the Huawei Band’s display can show more information with a well-sized, readable font, compared to the Xiaomi. The Xiaomi Band is fine and is a good choice if you want very simple software. The Huawei, on the other hand, is more complex, so it may not be ideal for users who aren’t ready to invest some time in learning the software.

[@kaynejk9629]

@ thank you my friend.. now is the universal version available anywhere ? Or just Chinese

[@GauravYadav-9166]

Most quantified channel on youtube

[@grundschul-mathe-profis2773]

Thank you very much for your videos. Are you planning another one for the Fenix 8?

[@3jerryliu]

Hey there! Your videos are super interesting and helpful. I used them to help me decide my last watch to buy and I'm watching again to decide if that should change any time soon. However, I have 2 suggestions that I think would make the data visualization more clear AND impactful to the viewers (would be cool to hear your thoughts even if you don't agree!) 1. The current line chart used for heart rate correlation and order seems a bit confusing. I feel like correlation should be on the Y axis as the independent variable, and the position on the X axis. This way, you could also have a bar chart where it's easier to compare how close/far in correlation each device is. Right now the vertical line makes it feel like their heights should be compared (given how we generally read graphs) but they're all linearly spaced because it represents the position and not the correlation. Hope that makes sense. 2. Would be very very interesting to plot some of these correlations/accuracy/performance with another variable on the other axis like Price. That way, we can see the price to performance correlation and if there are any positive or negative outliers when it comes to price. It looks like you always research the price and mention it so I feel like incorporating this into the visualization would be great :)

[@iamthebest22]

any chance to test the ringconn gen 2?

[@ameerbarakat3499]

Thanks best reviewer

[@jremmm]

What do you recommend for users' purpose to exercise by jogging and sports like basketball? Xiaomi band 9, Huawei band 9, or Xiaomi Redmi 5 Active?

[@stefanconstantinescu1576]

Why not Fenix 8 ?

[@RedGunBullets]

Why not [insert any name] ?

[@stefanconstantinescu1576]

@RedGunBullets Garmin is not " any name"

[@johnburr2662]

Thanks for the balanced review. I've read some reports that the Mi Band 9 has an inaccurate step counter when running/jogging. Have you experienced or tested this yourself?

[@fahdhasnain979]

Great review. Suggest me any 3 best fitness band.

[@stitchez08]

it would be interesting to see you compare the data across the three mi band modes (wrist, necklace and shoe) and the accuracy where possible

[@DavidsOldChannel]

Thanks for the amazing video. I got it as a replacement for my Mi band 5 and mostly for sleep tracking but it was so way off even with my band 5, especially registering that I woke up many times for a long time during nights, that I just returned it. Felt like a complete waste of money.

[@jayshukla4926]

Great content however it will be great if you can include basic tests like step tracking accuracy, calorie burnt, active time etc...thanks.

[@MrHsrb]

Excellent reviews, could you please make a review for a Cubitt Aura Pro

[@akhilgovekar2212]

Hey man, make a video on best smartwatch/band of 2024. Waiting for your review.

[@Snovador]

Could you be able to do a full scientific review the new Xiaomi Redmi watch 4 and 5. They're the newest releases and based on your old video of the Redmi Watch 2 lite and I am fairly certain that you'll be presently surprised! Plus its a very budget option so it might appeal to a lot of your viewers. Thanks Rob for these amazing reviews and keep up the effort!

[@joseafonso5671]

Hello! I would like to present my recent feedback about HR monitoring with MiBand 9. During the day it measures just fine (working at my laptop, cooking, etc and even within intense periods like working out, the HR sensor works fine). However, at night, while I'm sitting/lying in the couch watching some TV, the band starts record values like 125-130bpm . When I manually start measure HR, it starts at 125-130bpm and after that goes down to 55-50-46bpm. In the next minute it's high again - and I still remained relaxed in the couch...Do you have any insight on how to avoid/correct this? I've already sent back the first one to the warranty - they said it was fine. I bought a new one, the problem remains...

[@janeyannachicken9053]

Would it help to put a sweatband over the watch to keep out ambient light?

[@gabrielgold1126]

hey , thanks for sharing . how's the mi band 9 for swimming ? have you done any test on it ?

[@mjhdfdnllh]

Hi Rob! I really love all your videos and always consider your reviews before buying any tracker. Maybe, you could add a review of the Suunto Race S? I’m super curious and thinking about getting one. I checked your channel, but didn’t see any reviews for this brand yet 🤔

[@helin1504]

Is the calories burned indicator accurate?

[@movielover8548]

Sir! How you collect data for making graph? Manually or automatic?

[@RavagerCP9]

Best reviews as always! Are you planning to test redmi watch 5 lite? seems to be interesting choice

[@BRSPro]

That sucks compared to Mi Band 9 since both are the same price & Redmi Watch 5 Iite offers more stuff at a budget price.

[@mianharis6912]

Please make a review on mi band 9 pro

[@herupujiraharjoraharjo6502]

I'm glad to watch your review soooo scientific. Rob, please review/ compare between huawei band 9 and Huawei watch fit se. Which is better?

[@reeceanderson9293]

Rob, what is the best sports watch for sleep tracking excluding Apple Watch?

[@lowkeygaming4716]

I'm not exactly athletic but want to track my health easier and haven't had a fitness tracker before. Is it worth it to have this one considering it's accuracy?

[@gedi20]

any sign of when we will bet getting the Fenix 8 reeview

[@Labib-dw1lk]

When Will you retest the mi band 7 for sleep?

[@erwset]

Are you going to make a review of the Massimo W1 smartwatch or Massimo Freedom?

[@khelgarironfist3301]

How about step and distance tracking during running?

[@patrickdk77]

I only use it for email/phone alerts and the time. The health features I know aren't good, but I like to watch your videos to know exactly what to expect for those features, as they aren't my use case for it. I cannot hear my phone ring, and it's vibration rarely is any better, the band has solved this really nicely, and the text info to know if I should even bother. For me personally the display on this new one made it worth the upgrade, really didn't like the 8 much, loved my 7 but I lost it (stupid strap thing to hold it in the band didn't fit nearly as securely as the 5), skipped the 6, and the 5 was nice for it's time but screen was really limited.

[@OfirilFPV]

Will you do the Scientific test to the withings nove ? It’s looks like a nice smartwatch

[@madgo21]

What’s the most scientifically accurate fitness tracker around 50 euros that you would recommend?

[@danielbures9553]

Would you recommend this over watches in the same price range? What is the best watch in this price range? Would it be the fitbit charge 5?

[@mikoajdomanski8597]

Please make video about Athlytic app and how it compares to Whoop with for ex Apple Watch Ultra