Polar RS300 X Heart Rate Monitor Watch (Black) Review

5.00 avg. rating (95% score) - 1 vote


Polar RS300 is for the people who want a user friendly, accurate and good looking watch with all modern functions at an economical price. It has a great display screen with good menu functions. You will easily find out your desired function in watch without any help guide.

Watch has a new feature of “Polar Index” to correlate your MVO2. Watch has a GPS linking facility within to calculate your running distances on more precise scale. As watch is especially designed for running, cycling purposes, it comes with a foot strap too.

Watch has a good chest belt with a transmitter which can be fixed with it. Transmitter sends cardiac data to wrist unit which displays it you. It measures your average heart rate, length of workout, etc. There is also a calorie meter in it which counts the number of calories you have burnt in Kcal. Foot strap comes with the complete watch package too.

Its basic functionality is to measure your average speed during running, cumulative time, etc. With the attached GPS technology, you can measure your running space in a single run. You can store up to 99 laps.

Various heart rate target zone can be created with the help of multi profile settings. So that you can do different sports exercises with one watch on hand. Also, smart alarm feature always warns you when you are out of your target heart rate zone. Watch can be easily synched up with all training machines at your gym or home. So you don’t need to watch your hand while exercising on fitness machine outfits.


Polar RS300 comes with a water resistant display up to 50 meters of depth. Watch has a user replaceable battery with a good backlight. Display has a zoom option too. Special Event countdown timer always reminds you of the next coming event.

You just need to set it before your event date. Watch has stop watch and an alarm too. Alarm can be snoozed in times of need. Time has both available formats of 12 and 24 hours.

Watch has a G1 GPS sensor to integrate your running pace with the distance you covered. Foot strap is of the model S1. “Polar Own Cal” feature allows you to calculate your energy expenditure and accumulated burnt calories in a workout. To analyze your results, it tracks your latest 16 training sessions and last 16 weeks of workouts.


Polar RS300 has sensitive buttons so you need to take care while operating it. Chest strap does not contain the same old cloth electrode portion. They now replaced it with the plastic one. So it might be problematic sometimes in holding moisture which in turn could affect your heart rate readings.[/wptab]

Customer Reviews

[usr 4.5]

According my own experience with monitors, hats off to Polar RS300X. It is very accurate, intuitive, packed with features, and easy-to-use. The sport watch is also very affordable at Amazon.

My past experience with heart rate monitors includes four Polar HRMs and monitors by Suunto, Garmin, and Timex. Polar have so far proven to be my favourite brand in the market as far as pulse rate measurement is concerned. The results are even better when Wearlink fabric transmitter is used. Another cutting edge for Polar has been its HRM’s compatibility with most aerobic gym equipments, for instance Treadmills.

However, most of the ones I tried do not have detailed manuals and intuitive interface. This exactly the opposite of the Timex I used. The Timex had the best watch with easily navigated menu, and a large and clear display screen. But the Timex HRM was not working, and so I had to send it back to Amazon. I can’t tell whether it had to something to do with transmitter, but I also tried electrode gel to make it work in vein.

When I decided to go Suunto, I chose the T3C model and it was pretty cool, and looked like a conventional watch. Its HRM functioned well, but it also had the interface issue. The heart is displayed as the main object and is easy to read, but the same cannot be said of the smaller lower display, which includes time or your chosen subject. The reading is tiny and illegible when running. Another thing with this model is that it does not display adequate information on the primary display.

The Garmin I used was the Forerunner 410 and it proved to be a reliable HRM, but I never liked its thick and unattractive watch. When it stopped working, I sent for it for second time. In the process, I noted that the Garmin customer support exceptional. It came with the foot pod but I’ve never used the accessory for measuring distance. While its interface is intuitive, it has a few flaws.

And that now brings me to RS300X, which has easily beaten all the other HRMs I’ve ever used before. While buying it, I was only looking for a good heart rate monitor with convenient lap timing abilities. Today I went for my long runs and I had it all the way. It is the master of accuracy when it comes to heart rate measurement, and it rapidly did it in a twinkle of an eye. I’m surprised that there are some complaints about its display being unfriendly to older eyes. I use sunglasses, but still I’m able to read the display very well. The menus are easily accessible as they are logically organized. What’s more, there are hints when scrolling through the menu options.

One of RS300X best shots is its efficient lap timing abilities. It simultaneously displays the heart rate, lap time, and cumulative time. This makes it easier for long runners to check their pace each mile without interfering with heart rate monitor. This is one of the reasons why it is such a great training accessory, especially for interval laps.

[usr 4]

The watch/HRM has a number of features. I have just started using the “Polar Index”, which measures the resting heart rate. It uses the rate to statistically calculate theMvO2. Though you can measure your resting heart rate manually, this feature measures it for over five minutes and obtains the average. It is tricky to check your pulse al those minutes. It equally does a good job in automatically defining training zones, and it monitors your stay in each zone during the workout.

Polar has long been known to produce good technology, but the past few models have had one flaw after another. This model, the Polar RS300 has great interface and is all rounded. Perhaps this is a promise of better products to come.


  • 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).
  • Simple-to-use wrist heart rate monitor/training computer in black helps you to train at the right intensity
  • Provides metrics for heart rate, speed, distance, pace, and calorie burn
  • Tracks your latest 16 training sessions and your last 16 weeks of training
  • OwnZone feature for individualized zone training by heart rate or pace, a fitness test, and auto lap splits
  • Includes Polar WearLink+ 31 coded transmitter; compatible with S1 foot pod and G1 GPS Sensor

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