Polar H9 Heart Rate Sensor – ANT Plus/Bluetooth – Waterproof HR Monitor with Soft Chest Strap for Gym, Cycling, Running, Outdoor Sports
£38.99
Price: £38.99
(as of Jun 02, 2025 19:22:19 UTC – Details)
From the brand
It all began in 1977.
This is the year we launched an entire industry.
We had the foresight to see the incredible potential in wearable devices, and we’ve led the charge ever since – developing the most advanced, trusted, and innovative technology that can be worn by anyone who wants to understand their bodies better.
Polar’s award-winning product range includes GPS sport watches, fitness smartwatches and heart rate monitors.
Who is Polar?
A collection of minds built around an idea that was born over forty years ago on a cross-country ski track in northern Finland.
Where is Polar based?
Polar HQ is situated in Oulu, Finland.
Today, Polar employs 1200 people worldwide, has 26 subsidiaries globally and manages a distribution network supplying over 35,000 retail outlets in more than 80 countries.
The products we make are the result of years of unparalleled innovation in science and guidance technology – this is the leading differentiator between us and everyone else.
Polar Research Center’s key focus areas:
Physical activity & Behaviour,Exercise & Sports Training,Sleep & Recovery,Sports Nutrition,Data & Science,Biosignal Technologies
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POLAR presents a new affordable HRM when you’re looking for a reliable high quality heart rate monitor for your everyday sports Polar H9 is a trusted choice of HR sensor that fulfills all your needs
Gold standard in heart rate tracking built on decades of scientific research and development recognised by both regular users and researchers around the globe Polar is proud to be the Gold Standard in HR tracking
CONNECTIVITY OPTIONS: Polar H9 connects to sports and smart watches (Polar Garmin) activity trackers gym equipment and other bluetooth and ANT+ devices
Now your cardio workouts are more effective: From gym to indoor cycling via jogging and group exercise, track your heart rate and get an accurate calorie burn
Turn your phone into fitness tracker: Enjoy endless connection possibilities to Polar beat, Polar club, peloton, Nike+ run club and other popular fitness and training apps
Customers say
Customers find the heart rate monitor highly accurate, more reliable than wrist-based measurements, and easy to use, with straightforward pairing and comfortable wear. The connectivity receives mixed feedback – while it connects easily to ANT+ and Bluetooth devices, some report it won’t connect at all. Build quality, battery life, and value for money also get mixed reviews, with some praising the construction while others report reliability issues, short battery life, and consider it a waste of money.
AI-generated from the text of customer reviews
10 reviews for Polar H9 Heart Rate Sensor – ANT Plus/Bluetooth – Waterproof HR Monitor with Soft Chest Strap for Gym, Cycling, Running, Outdoor Sports
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£38.99
MR –
Super device, comfortable and compatible
A great device. I have seen previous comments on battery life, but key to this is, as the instructions say, to disconnect the device from the strap after use. Simply because the monitor uses the connectors in the strap to take your heart rate. So if you leave it connected it is constantly scanning e connectors for a heart beat . So unclip it once finished and the battery life is âmuch extendedâ. Itâs very comfortable to wear and linked to my concept 2 PM3 seamlessly. At the same time it linked via blue tooth to my smart phone and the Polar Beats app for supremely accurate measurements. Amusingly I had selected rowing, but of course after 80 minutes of rowing it confirmed I had covered a mile as it was measuring the GPS wander of my phone on a stationary rowing machine. Great and aSuper improvement on the T31 which I had before.
surfthemaze –
Good connection
I use this to connect to an indoor rower and also my bike computer. Faultless and more reliable than the Polar HRS it replaced. Good buy.
Peter Bell –
Works well, great value. Watch the extended warranty.
Bought this to pair with a Garmin Fenix 6 Pro. Works flawlessly over Bluetooth. ANT+ didn’t seem to connect properly, but Bluetooth works well.Once paired, the Polar automatically connects when I strap it on. Heart rate measurement is way more accurate than the wrist monitor built into the watch. I was struggling with higher-end heart rate values, knowing my rate was in the 140s and the wrist monitor on the watch was showing in the 100s. With the Polar, my heart rate was instantly being measured correctly, and I am now able to properly measure my cardio output for fitness tracking.Very easy to use. Once paired, snap onto the chest band, connect the strap ends and you’re away. Automatically reconnects each time with no faffing. When finished, unstrap and pull the monitor off the strap and it goes to sleep. Perfect. Strap is washable. Very comfy to wear and doesn’t slip when training.I looked at the H10 as well, but it’s a lot more expensive and I decided I just needed an accurate heart rate monitor. So the H9 is great value for my needs. Cheaper than the Garmin equivalent.I suppose my only gripe is that to get the extended warranty, you have to install the Polar app and sign up, giving them all your details and allowing Polar to start gathering your health stats. No thanks. I installed the app to get the latest firmware, but then uninstalled it and I don’t need the app now. Just using it with my Garmin and their app. Loses a star for that practice: happy to register for an extended warranty and even sign up for their emails, but I’m not sending them all my personal data on an ongoing basis. At this price I don’t care about the extended warranty.
Royden –
The Gold Standard
This review is for the Polar H9 Heart Rate Monitor (HRM) in Black. I purchased the HRM to prep for a Half Marathon, my first ever, with the hope of using it for Low Heart Rate training. It has been an excellent choice for a beginner like me and has helped accurately track my heart rate during runs. This has helped me improve my runs over the 2 months I’ve used it so far.Build and Quality:The HRM unit and the strap come packaged as separate items. The HRM unit is compact and lightweight, made from a durable plastic and the quality feels solid. Just holding it in your hands you can tell that the plastic is strong enough to withstand any bumps, etc. It houses a CR2025 battery that you can get to using a prying tool. The ‘Soft Strap’ is just that, a strap with a fine-weave and feels velvet-feel to the touch. The quality seems good and like anything elastic its durability will depend on how much it is stretched. It is adjustable and is fastened using a hook into a loop and the HRM unit and strap are connected together with a pair of snap fastener buttons.Features vs Functionality:Polar HRMs are known for their accuracy and I can confirm this sensor is spot on. The H9 is accurate and also very responsive to changes in the heart rate with minimal lag. Where my Garmin wrist sensor would lag before reacting to heart rate changes, the H9 was pretty much instant. Although, for the strap to measure heart rate accurately, the conducting area on the strap needs to be made wet before use to begin with and the sweat then keeps it wet for the rest of the workoutThe strap is made from a comfortable and flexible material and sits snugly against the skin once adjusted appropriately. I’ve not had any chaffing and on tuns I don’teven realise I have the chest strap on. I don’t particularly sweat too much so all I do it wipe the strap down after use and its good to go for the next workout. For sweaty runners, you may need to wash it more often which might impact its longevity.As for connectivity, the HRM is easy to connect to Bluetooth devices and once paired will automatically connect the next time as long as the HRM is snapped to the strap. I’ve also tested connecting two devices and both recieve the heart rates in real time. However, if you ever need to let your running partner to use the HRM then you’d want to unpair this from your fitness tracker first before they connect to it. Else it would send their heart rate to your tracker.The claimed battery life of 400 hours is great but difficult to verify. So what I do to ensure the battery lasts is to unsnap one of the button from the strap to break the circuit.Value for money:The H9 provides accurate heart rate data for a fraction of the price of the H10 as long as you don’t need the memory of the H10. This as brilliant value for money, specially for beginners.
Chris –
Just works!!
Had many Polar HRMs, they always just work. Obviously, the big difference with the latest breed is the ability to connect to devices other than Polar Watches etc. And, the ability to change the ruddy battery (which you couldn’t previously do)!! Slightly more expensive than others but why compromise for a relatively small amount??? One thing to be aware of, you need to select “Advanced” in the “Bluetooth devices discovery” option in Windows if your using a Windows based training app (to enable Windows to see the device).
victorg001 –
Très efficace
Burak –
Nabız ve kalori takibi yapan sporcular için kesinlikle alınması gereken bi ürün. Iphone da polar uygulamask ile herÅeyi takip edebiliyorsunuz.
Alessia –
Perfetta per monitorare gli allenamenti (anche in gravidanza e non da fastidio). Facile da indossare. App semplice. Ricordatevi a fine allenamento di staccare la fascia dal dispositivo o consumerete la pila in poco tempo.
Rohit Malhotra –
Does itâs job. Simple setup and straightforward to use . Have been using for more than a month and has worked flawlessly. Mainly used while cycling and a few times for brisk walks. Heart rate readings are consistent without drop outs
Ernesto Salcedo –
He probado varias marcas y la mejor ha sido Polar. Recomendable.