Polar Grit X2 Pro Hands-On: A Scientist's Perspective (Heart Rate, GPS, Build)

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Reference devices:
ZMax + Dreamento: www.biorxiv.org/content/10.11... & github.com/dreamento/dreamento
Polar H10: pubmed.ncbi.nlm.nih.gov/31004...
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License code: OBLD6VBBCTRDFZQP
Timestamps:
00:00 Quick Intro
01:58 Models and Materials
02:36 Price (Expensive)
03:11 GPS Upgrades
03:25 Strava Routes Added & Komoot
03:54 Breadcrumbs
04:09 Easier Route Sync
04:33 Vertical Speed & VAM
04:55 Battery Life
05:16 Difference With Vantage V3
05:35 HR Algorithm
07:17 Elixir HR Sensor Feedback from Polar (on V3!)
07:46 Elixir HR Sensor Test (V3 on Right Hand)
11:01 Elixir HR Sensor Test (V3 on Left Hand)
15:18 Elixir HR Sensor Test (V3 on Theresa)
16:53 HR Algorithm Update Explained (Released April 2024)
18:15 Conclusions
This is the brand new Grit X2 Pro from Polar, which is aesthetically my favorite watch from Polar, and it comes with some exciting news. And this news is not just about the Polar Grit X2 Pro itself, but also about the Vantage V3. The reason is that it concerns a firmware update rather than a hardware change, and this firmware update will come to both the Grit X2 Pro and Vantage V3. In fact, the Grit X2 Pro and Vantage V3 are very similar, having identical electronics and software, with the main difference being in housing and design. In this video I will first concisely describe the new Grit X2 Pro and what it can do. After that I will share some details of how this new algorithm works. Now, I am not allowed yet to test it in this video, but of course we will put it to the test once it actually comes out. Finally, I also discussed with Polar why I was getting relatively bad results with the sensor set in the Vantage V3, which is the same as the Grit X2 Pro, and of course today I’ll also share what we found. Plus, I’ll show some more testing of the Vantage V3, including some quick tests on Theresa, since it turns out I might be the problem. So, let’s get started and talk about the new Grit X2 Pro hardware and firmware.
First off, a disclosure, Polar sent me this sample of the Grit X2 Pro for testing, but they did not have any influence on this video or on my opinion, except for some fact-checks I asked them to do. Also, this video will be a bit different from my normal videos, since we are not allowed to do any testing yet. However, what I can do is show you some graph-drawings that represent how the new algorithm will work. And I can also show you some new testing of the Vantage V3, which has the same electronics. Finally I can share what Polar said when I shared my V3 data with them. However, first, since the Grit X2 Pro was just announced, let me briefly share the 10 most important things to know about the Grit X2 Pro!
Polar is set to release two distinct models within its Grit X2 Pro series: the standard Polar Grit X2 Pro in night black and stone gray, and the premium Polar Grit X2 Pro Titan. The main differences between these models are in materials and aesthetics.

[@TheQuantifiedScientist]

🔴 General Amazon link*: geni.us/thequantifiedscientist 🟢 Instagram: instagram.com/quantified_scientist/ 🟠 Shorts: studio.kzbin.info/door/cpARGzXNaC62UQWns2dh2Q 🔵 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. 🟢Check out Max’s Blog: blog.kto.to/accuracy-fitbit-charge-6-vs-home-psg-eeg-sleep-lab ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 👇 $30 off any new WHOOP membership, affiliate* (paid) link, supports the channel!👇 join.whoop.com/QuantifiedScientist ($30 off any new WHOOP membership) ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 👇Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!👇 ▬▬▬▬▬▬▬▬▬▬BEST DEVICES▬▬▬▬▬▬▬▬▬▬ 🔴 Oura 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) 🔴 Whoop Strap 4.0: join.whoop.com/QuantifiedScientist ($30 off any new WHOOP membership) 🔴 Eight sleep 200$/150$ discount*: eight-sleep.ioym.net/TheQuantifiedScientist + add code “TQS” for 200$/150$ total discount 🔴 General Amazon link*: geni.us/thequantifiedscientist

[@bakabonocat5107]

Gshock gbd-h2000 please❤

[@ashishmathewvarghese2128]

Can you make a video of One Plus watch 2 ?

[@asan1050]

Thanks for posting this video.

[@Donald5557_]

Could you do one on the Scanwatch 2? Also love your videos dude. Super informative and entertaining.

[@klaudio07041985]

Been following your reviews for almost 1 year. From a data lover: you're the best in analyzing the sensors. Would love a full review and comparison after the first firmware update with the vantage v3. Also, any chance of reviewing the Suunto Race?

[@aaakmm1785]

Very impressive video. Cooperation directly with Polar is very impressive. Is there a list of Polar watches that will get improved HR accuracy?

[@michaelpetrovich9363]

Hi Rob, First thank you for the tests you do and share with us. Do you have a plan to start testing Suunto watches in the near future? Suunto are focusing on sports and outdoor activities and will be very interesting to see them on the same charts with Apple and Garmin.

[@williamstevenson2649]

Good to see a follow-up on the Vantage V3, and probably another one to come following the release of the new software. I was a little put off by the original HR performance, and it would be good to see an improved performance. It looks as if they're fairly confident of that!

[@kolapsus]

Thank you for your review. I was wondering if there are any plans for a review of the Redmi Watch 4?

[@rdnax5775562]

...though I loved Polar back then with the FT80 and later the V800, they always had their quality issues and shortcommings... They got overpaced in features and software by garmin and the wave of smartwatches since the mid 10s... So this looks finally like their first great "catch-up" watch... Hope they will offer great accuracy, quality of metrics and software-algos!

[@MD_Builds]

"Spinning is a easy exercise" is not the sentence I expected to hear today :p (but I got what you meant)

[@zhengyang6693]

Waiting eagerly for the oneplus watch 2 review, hopefully there's enough interest from the community to make it happen!

[@GabsARV]

Another great scientific review, Rob! I love dedication you put in to these kinds of videos. I'm obviously in no position to say, but I'd very much appreciate a scientific review of the newly released Huawei Band 9, sporting the TruSeen 5.5 and TruSleep 4.0 like on the Huawei Watch GT4s.

[@TheSpectre15]

My heart rate with the V3 had been rock solid

[@jermainegeorge8916]

Hi Rob. I'm looking forward to your review of this device once you are able to thoroughly rest it. I lost my Polar Ignite, and I'm looking at this as a candidate to replace it. The other watches I'm looking at are the Casio GBDH20001A and Casio GPR-H1000-1, both G-Shocks. What makes the GPR-H1000-1 interesting is that it's running Polar software. Could you possibly get ahold of and compare and review these G-Shocks? I'm curious to know if Polar software runs just as good in other devices as in polar, and if the H10 strap works with the G-Shocks. I can't find information if they do or don't.

[@AMARFPV]

Great video again ! Please review the Ultrahuman Air Ring, i'm considering it.

[@tommybahamax]

Lol

[@trirayu]

Could you test HR accuracy from garmin forerunner 265?

[@JasonRaneses]

As a fan of the Polar Verity Sense, I’d really like to see Polar up their game on the watch front. They are making a big leap in terms of the new price point for this watch. Had it a MSRP of 20%, customers would be more willing to roll with its issues while Polar gets the instability figured out.

[@theerkenbrand1358]

Instinct 2X solar review?

[@hadid90]

please present and share your benchmarks for all devices somewhere we can easily read and use to compare when looking for a smartwatch

[@albertng7440]

sir, could you make a review about blackshark smartwatch series, cause i find them as one of the most affortable smartwatch that has good specification

[@jani-2254]

Polar has been quite disappointing for many years when it comes to wrist based hr tracking... Could you do a review of the OnePlus Watch 2? That seems to be a positive newcomer to WearOS lineup 😊

[@ricardor890]

My experience with polar products I've been using polar products since the late 1980's and since rcx5 I've been disappointed The 800 series was junk I had 4 of them I have the vantage V1 and V2, the optical tracking is terrible and I experienced similar results as you have on the version 3 model. On hot days and I sweated alot the heart rate is very erratic. I use a loop track which I measured with wheeled measuring device and is 1478.3 m, the polar device would measure it at somewhere between 1430m and 1465m, while the other devices I would use would be consistent to within 5 m Polar wants to charge a premium price for the product and it is fallen well behind the competition Thank You for the reviews I look forward too them each time

[@FOREST-9351]

Please make accuracy test of oneplus watch 2 🙏🙏🙏🙏

[@danirana9311]

Can you simply tell us when we have a comparing heart rate to apple watch when weight training

[@bengodgundam]

I hope when Samsung Ring is out, you can get invited for testing!!

[@miguelsilva3137]

Very good video! I bought the Vantage V3 and H10 because of your reviews! 😊 Is there any way to record a train session with both sensors? V3 in the wrist and h10 in the chest?

[@SergSolod]

You can pair your H10 with the Strava App and at the same time turn-off its connection with the watch. This works for me as I've been testing accuracy Garmin Venu 3, Garmin Venu 2, and FitBit Charge 6.

[@anokhav]

The latest smart CASIOs like g-shock dw-h5600 and gbd-h2000 claim to use polar technology for their health functions. Could you make a review on either of them as well? Thanks for your channel!

[@VishalSingh-jl7oy]

Can you please do a review of OP watch 2? This will be helpful if you do a complete detailed review. Thank you.

[@bblackbadgerr]

Still yet to hear from you about OnePlus watch 2. Hope you can get your hands on it

[@anthonyrampino7734]

When using a chest strap, can you see your heart rate from both the watch and the strap?

[@quaterb8890]

Samsung fit 3 review when?

[@TheQuantifiedScientist]

Testing one on myself now, and one on a colleague from today onwards

[@Lxncee0]

​@@TheQuantifiedScientist Hope to see the results since i'am not sure for the results with it

[@NostalgicMem0ries]

@@TheQuantifiedScientist awesome, cant wait!!

[@mrheru8627]

​@TheQuantifiedScientist well well, thats awesome and i cant wait for your review

[@bidhananjeev654]

Haha i was just gonna ask the same thing lol... Waiting for the fit 3 review @thequantifiedscientist. Love your videos💪

[@legockysandor]

Has the update been released?

[@douknodaway]

Xiaomi Redmi Watch 4 review when?

[@RONNIE198915]

Can you also do a reivew on amazfit active?

[@kajetanwojnarowski2693]

Can you review Ultrahuman air? I saw that you did oura ring already ☺️

[@notsurenone2199]

thanks

[@TheQuantifiedScientist]

You're welcome!

[@wsewlal]

1. How good is the HR monitoring for people with a darker skin? 2. Could you expand on the underlying mathematical model used for comparison with other devices? If it's purely timestamp comparison w.r.t. the reference, then the 'correlation' might get terrible results while a simple time-translation might yield really good data (think of lag in timeseries).

[@MartianEconomist]

Please make a review for Xiaomi redmi watch 4 :)

[@mikayel18ify]

can you please do a review of KOSPET TANK M3 Smartwatch ? if you validate the data, it's a good buy

[@milzar]

Ultrahuman review when?

[@taro2118]

Can you make a video for the novamos S6? It says it has dual chip dual system ultra long standby to reach 2 days of light usage in 4G mode and 5-7 days of light usage in sport mode

[@miguelm6587]

Rob! Please make a scientific review of the Morpheus Training System!

[@henzoarruda4582]

When you have the opportunity to test it, be sure to bring us a complete analysis of the new Smartwatch Xiaomi Watch 2 with Wear OS, it has great differences and comes to compete directly with the Galaxy Watch and Apple Watch

[@user-zo9gz2mx7c]

xiaomi watch s3 review please

[@zsoltvarga2406]

Ultrahuman Ring Air Review ? 😊

[@paulussantoso1797]

xiaomi Watch 2 Pro Please,,😀 xiaomi is notorious of having an OK sleep tracker in all of your tests, would like to see this one.

[@laoluomisade2438]

Polar makes very good and accurate chest straps but their wrist based watches' heart rate accuracy seems to be way off

[@BLNKT.]

OnePlus Watch 2!

[@michamaecki5678]

Honor band 9 please

[@gravity4576]

Plz do Oneplus watch 2 !!!

[@nrgyu4508]

Hi Rob, I've just updated to the v2.0.19 FW the V3...let's see but now I have no hopes anymore. Might be that the V3 is the LAST POLAR for me. I have enough! Not having all those watches you have but still some of those that I've tested, liked or not. The V3 is the worst HR device I have EVER seen in last years, compared to other Samsung, Huawei, Fitbits...referencing to the H10 strap of course (FW 1.3.5 in my V3 up to this morning). For the sleep tracking, I don't know. No reference to compare (like the H10 for the HR/HRV)...I don't have the Apple watch (and maybe better as up to what I see in reviews I'll be even more frustrated ;-) ). The only good thing with the V3/X2 is the orthostatic test option, but I'm doing it with the H10 and V3, as well as HRV follow up with the apps like the Elite or Kubios, much more accurate/reliable. RIP Nokia, oups POLAR 😢...I really would like to give one try more and like it...let's see in next 24h as it's wrong HR is so evident that it shows up almost immediately (luckily ;-) )

[@PeterMoueza]

7:10 April 3rd 7:20 contact 9:34 outrageous diff ++++ 10:10 for me too, it is worse results (tennis) 20:20 side 22:20 outrageous diff ++++

[@Avarua59]

Conclusion: Rob's wrist is genetically optimized for Apple products. 🙂

[@asezen77]

I was expecting better HR results. Surprised…

[@racvv]

OnePlus watch 2?

[@TheQuantifiedScientist]

That's one I am still on the fence about testing. But there seems to be some interest

[@racvv]

@@TheQuantifiedScientist I'll wait for you before buying it lol

[@Kuk0san]

@@TheQuantifiedScientist please do I am waiting eagerly :D

[@Andre-yg3qu]

​@@TheQuantifiedScientist pls do It, the community needs to know about the accuracy of the One plus Watch 2🙆

[@ctw-home]

Bet it sucks big time

[@matpat1618]

Huawei band 9 pls

[@Sifarishwala]

Can you please check redmi watch

[@kolapsus]

which model exactly?

[@pmcmpc]

If you're working with Polar, or they're working with you, please ffs make the case to them for proper detailed patch notes, and even better, roadmaps. The patch notes are a joke.

[@foetor]

Outsch I thought they were good in heart rate measurement

[@jonathanperlin2]

Crazy wacko price!

[@TheQuantifiedScientist]

True, a lot of money, but it is in line with Garmin's more premium watches (Garmin Fenix/Epix).

[@3v3rb0t]

But compared to say a Google pixel 2...

[@martinlevy5833]

Why not allowed to test accurancy? Other youtubers did that…

[@danielmatias9333]

Samsung Fit 3 and Huawei Band 9

[@RohitSurw]

Please review Samsung Galaxy Fit 3.

[@sudhandhanasekaran9891]

Hi.. Your reviews are extremely awesome. Especially, I was amazed by your in depth scientific analysis. CAN PLEASE CHECK/REVIEW/ANALYSE THE ULTRAHUMAN RING AIR?? I am eagerly waiting for you to review that for very long time.

[@TheQuantifiedScientist]

Thanks so much! I hope I can review this watch fully soon

[@sudhandhanasekaran9891]

@@TheQuantifiedScientist actually, it's a ring/fitness-tracker. It's seems a cheaper replacement for Whoop and Oura. But, I'm not sure how accurate is the sleep tracking and heart rate at various scenarios. I'm eagerly waiting

[@dimaspanjiandalantama]

Forerunner 165

[@fluffypuffyboy586]

well that was a disapointment.

[@TheQuantifiedScientist]

The watch or the video :-)?

[@fluffypuffyboy586]

@@TheQuantifiedScientist the watch. I expected more from polar

[@jonathanperlin2]

Apple ring review when?

[@TheQuantifiedScientist]

When they make one ;-) 😅. Would be interesting!

[@actorjay]

Haha. Maybe he meant Samsung?@@TheQuantifiedScientist

[@PaulSamps-gf6yz]

Please do not bother with any watches that do not last less than 3 days on a charge. A waste of time

[@brianquigley1940]

Rob, I UNliked this video after | realized it was an advertisement and not a review... it's nice to hear about new features, but that's not the expectation you have set for your channel.