Polar Grit X2 Pro – ‘Mysterious’ New Icon Appears
More: Polar Grit X2 Pro Titan Review
OK, the mysterious new icon didn’t remain a mystery for too long.
The new Sennheiser MOMENTUM HR Earbuds also sense temperature. So Polar Watches, like the Grit X2 Pro, can take both temperature and HR directly from the earbud. Meaning that the new icon merely indicates that the Bluetooth Health Thermometer Profile is in use.
There’s more though. A new Body Temp screen automatically appears on the watch showing a rolling 10-minute track of temperature (it just so happens to be a horizontal line) with an average and max also shown.
Then in the workout summary, you get the same stats.
It’s all piped up to Polar Flow but all I could find on the web was ‘temperature’. And I assume that refers to room or ambient temperature as the data was completely different.
However, on the Polar FlowiOS app, there were some new data points which will probably look more exciting with some proper workout data in them! Today is my day off as I did a LOT of riding over the weekend and I can hardly move so getting that data in is a job for tomorrow, or the next day
Last Updated on 28 January 2026 by the5krunner
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID
Would this mean that the CORE body temperature sensor will soon be usable with Polar watches as well?
I believe it transmits data using the same Bluetooth Health Thermometer Profile…
Funnily enough I treid that last night and have asked the question.
the CORE sensor *DOES* as of now pair to the Grit X2. I’ve not played with it much more than that but the new screens that appear for the Sennheiser do *NOT* seem to appear for the CORE in all profiles.
the new temperature icon only appears on certain profiles and i haven’t investigated that further
Sounds encouraging!
I have a Vantage V3 which didn’t recognise the CORE sensor at all when I tried pairing it a few weeks ago.
I’ll give it another shot after the April 3rd update…
ok CORE does only work on X2 pro. not V3 or V2 or anything else AFAIK
Polar has said, as you suspect, that the Sennheiser and Core both follow the same BLE TEMP standard and any product that follows them will behave identically. The extra screens DO show for core on X2 PRO.
It looks like it’s a feature linked to FW2.X
v3: FW1.3.5
X2 Pro: FW 2.0.18
Wonderful news!
I’m guessing the Vantage V3 will be brought to an equivalent firmware to the Grit X2 Pro on April 3rd and thus gain similar CORE compatibility…
Many thanks for the update!
Polar watches so v2, grit pro v1 also?
i’d guess NO, but who knows really? could go either way
Ah, shame Polar is so behind competition on term of updating their 2-3 year old watches… Suunto can update even suunto 9 released on vantage v1 era