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Polar RS300X Heart Rate Monitor Watch (Black)

Polar RS300X Heart Rate Monitor Watch (Black)

  • Easy-to-use heart rate monitor guides you to train at the right intensity
  • Includes H1 heart rate sensor chest strap for continuous, accurate heart rate. Uses coded transmission to avoid cross-talk with other heart rate monitors nearby.
  • Built-in Fitness test helps you can track and monitor your fitness improvement
  • Displays accurate calories burned and records last 16 training sessions and your last 16 weeks of training
  • Compatible with S1 foot pod and G1 GPS Sensor for speed and distance (not included, sold separately)

Now our most popular and top performing running computer is enhanced with GPS speed and distance capabilityA smart, intuitive training computer for runners and cross-training athletes, the Polar RS300X wrist heart rate monitor helps you to train at the right intensity with personal training zones. It’s compatible with Polar’s S1 foot pod and G1 GPS sensor (both separately available), enabling you to combine heart rate with speed and distance and truly make sense of your training. Committed runners will find the most value in the real-time pace and distance measurement of the S1 foot pod, while those who mix up their training regimen with cycling, inline skating, paddling, mountain biking or hiking will be best served with the speed and distance G1 GPS Sensor. It comes with the Polar WearLink+ 31 coded transmitter (with changeable battery).

The RS300X helps you to train at the right intensity with personal training zones.

Polar RS300X Models
  • Basic RS300X
    – black and orange
  • RS300X SD with S1 foot pod for real-time pace/distance
    – black and orange
  • RS300X G1 with G1 GPS Sensor for cross-trainers
    – black and orange

The RS300X enables athletes to train at the right intensity and improve their performance through core metrics such as heart rate, speed, distance, pace, and calorie burn. Advanced features include Polar’s exclusive OwnZone feature for individualized zone training by heart rate or pace, a fitness test, and auto lap splits, which display average heart rate, pace and distance per lap. Athletes can easily review up to 16 past workout files to check their progress and ensure they’re staying on track with their fitness or training plan.

Features include:

  • Heart rate displayed as percentage of maximum heart rate, BPM, and average heart rate of total exercise
  • Tracks your latest 16 training sessions and your last 16 weeks of training
  • Visual and audible alarm in target zones: Informs you every time your heart rate and/or speed/pace exceeds the upper limit or falls below the lower limit of your target zone during a training session.
  • Polar OwnIndex Fitness Test calculates aerobic fitness (comparable to maximal oxygen uptake, VO2max) providing a reference to base training intensity and measure improvement.
  • Polar OwnCal: Shows your energy expenditure during one exercise session as well as your accumulated kilocalories during several exercise sessions. Because the OwnCal tracks both the energy expenditure during one exercise session and the accumulated kilocalories during a longer time e.g. one week, it helps in achieving both short term and long term goals.
  • Time in Target Zone feature calculates the amount of total training time spent in your personal target zone. You can use this feature together with the Total Exercise Time to determine the effectiveness of your training program.
  • Number of laps – 99
  • Watch features: alarm with snooze, dual time zone, stopwatch
  • Compatible with Polar FlowLink (available separately)
  • Water resistant to 50 meters
  • Backlighting, display zoom
  • Event Countdown Timer: Keeps your motivation high by showing how many days are left before your next running event (e.g., Berlin 23 days).

About Polar
The first EKG accurate wireless heart rate monitor was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. The concept of “intensity training” by heart rate swept the athletic world in the eighties. By the 1990s, individuals were looking to heart rate monitors not only for performance training needs, but also for achieving everyday fitness goals. Today, the same concept of heart rate training is being used by world-class athletes as well as everyday people trying to lose weight. Polar is the leading brand among consumers, coaches, and personal trainers worldwide and the company is committed to not only producing the best products, but also being the leading educator on the benefits of heart rate based exercise.

List Price: $ 169.95

Price: $ 88.50

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3 Responses to “Polar RS300X Heart Rate Monitor Watch (Black)”

  • ArizonaPilot:
    213 of 225 people found the following review helpful
    3.0 out of 5 stars
    Overall a decent product with some minor drawbacks, August 28, 2009
    ArizonaPilot (Arizona) –

    Verified Purchase(What’s this?)
    This review is from: Polar RS300X Heart Rate Monitor Watch (Black) (Sports)
    For some reason, Polar requires that these units be sent back to replace the battery, which costs $25 + shipping. On top of the annual cost of maintenance, this ship to replace policy leaves you without a heart monitor for about 2 weeks once a year.

    The other issue I found is that the reception range is not very good, so the unit won’t work well mounted on a bicycle.

    Finally, Polar has decided to arbitrarily remove the % fat burn function from some of its watches. This watch does not have it, so keep in mind you will not know what % of your calorie burn was fat.


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  • carunner:
    71 of 76 people found the following review helpful
    5.0 out of 5 stars
    Excellent basic HRM, May 28, 2011
    carunner (SF Bay Area, USA) –

    Verified Purchase(What’s this?)
    This review is from: Polar RS300X Heart Rate Monitor Watch (Black) (Sports)
    So far, I’ve found the RS300X to be an accurate, easy-to-use HRM with a nice set of features. At the Amazon price, it’s a very good value.

    By way of background, I’ve had several previous heart rate monitors. They include about 4 previous Polar monitors, as well as monitors by Garmin, Suunto, and Timex. Polar has always seemed the best at measuring heart rate during activity, especially if you use the Wearlink(fabric) transmitter belt. And since I often work out at gyms, the compatibility with most treadmills and other aerobic machines is an advantage. However, but all my previous Polar HRMs had unintuitive interfaces and poor instruction manuals. Timex was just about the opposite; they had the best receiver (watch) with large, clear displays and easily navigated menus. But I had to return both Timex HRMs that I ordered from Amazon because the heart rate function never worked. It seemed that the transmitter never made good enough contact with my skin, even when I used electrode gel.

    My Suunto (model T3C) is a pretty good HRM and the receiver unit looks good, at least if you like the look of a conventional watch. The main display item (eg heart rate) is very easy to read, but the smaller lower display (time or whatever you choose to show) is tiny and hard to read when you’re running. If you ordinarily use reading glasses you’re out of luck. Also it doesn’t display much information, perhaps because the main display item has such large pixels.

    The Garmin FR60 is an excellent and generally reliable HRM but the receiver is thick and unattractive. I just sent it in for the 2nd time because it stopped working. Garmin customer support, however, has been excellent. I got the model with the foot pod for measuring distances but I’ve never actually used the foot pod. Its interface is not entirely intuitive but it isn’t bad.

    The RS300X is easily the best of these. I wasn’t looking for a lot of features, only basic heart rate measurement and convenient lap timing. I wore it on a long run today and it rapidly determined my heart rate and seemed to be completely accurate the whole time. Some reviewers have complained that the display is hard to read for older eyes; I didn’t find that a problem at all even with sunglasses. The menus are logical and there are hints to direct you to what to do next when you’re scrolling through options. One of the most attractive aspects of this model is that it’s so easy to do lap timing. So when you’re running a marathon, for example, it’s very easy to check your pace each mile while continuing to monitor your heart rate, and it is great for interval training. It shows the lap time, cumulative time, and heart rate on a single screen.

    I’m also enjoying some of the features that I never thought I’d use. For example, the “Polar Index” is basically a measure of your resting heart rate that is supposed to correlate with MvO2. It isn’t hard to measure your resting heart rate, but this feature offers a convenient way to get an average heart rate over 5 minutes – not something you’d want to do by checking your pulse for that long. It does a really nice job of defining training zones automatically and reporting the time you spend in each zone.

    Although I call it basic this HRM has all the features I need for training and racing long distances. Polar has always had good technology but in the past was weak at interface design. They’ve made great strides with this model.


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  • Mike Hayden:
    78 of 86 people found the following review helpful
    2.0 out of 5 stars
    Electronics OK, crappy display, September 6, 2009
    Mike Hayden (Silicon Valley) –

    Verified Purchase(What’s this?)
    This review is from: Polar RS300X Heart Rate Monitor Watch (Black) (Sports)
    UPDATE: Tuesday, September 8, 2009 1:36PM

    After a couple more workouts and a few hours of trying to figure out this product… well, their user documentation is horrible, which means you must spend hours discovering almost everything on your own.

    I like the RS300X for its ability to track and store training data. (But, finding the data is a hassle thanks to poor documentation with no examples. Ultimately, I will have to spend time creating a navigation chart myself.)

    I like the chest band with its detachable transmitter and easy-to-replace battery.

    I don’t like the molded one-piece watch-band that forces you to wear the watch atop the wrist. I prefer to wear the watch on the side of my wrist where I can glance down to read, rather than having to raise my entire arm to read.

    I still don’t like the display because of its obnoxious glare and requirement of perfect up-close vision to read it.

    Based on my experience with the RS300X and other Polar products, I would now raise my 2-star rating to 4-stars (if I could). Without excellent and useful documentation – that SAVES MY TIME & FRUSTRATION – I can’t give it 5-stars.

    All my other Polar products have been reliable and of high quality construction. I assume the RS300X will be the same or better.


    Sunday, September 6, 2009 11:25AM

    I received my new Polar RS300X a couple days ago. I shoulda shopped around…

    I’ve been using Polar Heart Rate monitors since 1986. and have been pleased with them all… Until now.

    I bought this RS300X because I loathe the hassle of sending the equipment in for new batteries.

    While the RS300X electronics seem to offer many features, the smaller display is utterly crappy – a significant obstruction to my workouts!

    You must try to read the tiny display info through TWO glaring reflections off the clear plastic lens (glare NOT SHOWN in the photos). What good is the real-time feedback info if you can’t read it while running?!?!

    I assumed I would love this new product.

    Unfortunately, after only two uses, I hate this RS300X. If I change my mind after more usage, I’ll change this review.



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