Polar H9 XS-S Heart Rate Sensor Bluetooth & ANT+

Very good strap and monitor works great when on WATT BIKE

It was for my Grandson, he is very pleased with it.

I bought this to support zone 2 running. I went for a small strap. It is easy to put on, comfortable and stays in position. I paired the HRM successfully with my Garmin Watch. After starting to run the HRM seems to present accurate readings, with a steady increase in heart rate, however after about 800m the readings drop back down until about 1.5 - 2km when they shoot back up and thereafter are consistent and reliable. I do wet the straps and my chest and have moved the monitor slightly to the left of centre, but still only once do I believe I have had an entire run be accurate. A little disappointing, however over longer distances it works fine and I am able to track zone 2.

I've been using HRMs for 20+ years, mostly Garmin devices. I've had 2 Polar HRMs in this period and, I don't know if it's just me, but they seem extremely unreliable versus other brands. Firstly, my old s410 used to frequently show the heart rate as 50% of the actual value. Now, my H9 keeps recording huge troughs and peaks in HR that are fictitious. This is frustrating as I track several fitness metrics that rely on accurate HR data. For the record, I'm fastidious about moistening and cleaning the strap, and adjusting the strap tightness. I've reached out to Polar support and sent evidence of the H9 issue and I'm awaiting their response. If the issue is satisfactorily resolved I'll update this review. At this point though, I cannot recommend this product and wouldn't buy any other Polar product. Update 27th October 2025: Polar Support have been very slow. I've had to chase them twice so far via web chat. They eventually sent me a set of steps to follow, but it has made no difference. Have escalated back to Polar and am expecting to get a response within 48 hours. We'll see.

Very straightforward and easy to set up and use with online app, no connectivity issues so far, which I’d read sometimes happened. Comfortable - but not used in fitness training, only for short time each day for measuring HRV. Accurate as far as I can tell. Not had long enough to determine battery life but fine after one month.

Great HR strap. Works well with Samsung phone and appa like Nike run etc.

Amazing value for money, great product, easy to use.

Barely ever works, and goes through batteries in a day or two. It was alright apart from the battery usage for about a month, however now even with a fresh battery it won't connect for more than 5 minutes.

Working amazing. Can connect with Runna, Strava and also XOSS you can track your runs, your cycling everything and check whether your aerobic base is improving or not

Dans mon cas, cette ceinture cardio est utilisée pour fonctionner avec l'application polar flow. Attention, le XS et S sont vraiment petits.

I've owned garmin and wahoo monitors which often drop signal or simply fail after 1 season. Polar is only consistently reliable HR monitor and lasts for years

The around-the-chest strap was much too small for me, but I simply unplugged the sender and re-plugged it into my old FT7 strap. Perfectly compatible. Far more practical that a smartwatch when cycling uphill or engaged in the fun of catching someone or fending off pursuit. With the receiver strapped to the handlebar of my bike, I have a real time readout much like a tachometer. Seriously high-quality piece of kit.

cela va faire quelques mois que la bande ne fonctionne plus. j'ai fait que quelques course avec et deja le bleutooth ne marche plus. a eviter