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  • Polar RS300X Heart Rate Monitor, Black
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Polar RS300X Heart Rate Monitor

by Polar
483 customer reviews

List Price: $169.95
Price: $97.00 & FREE Shipping
You Save: $72.95 (43%)
In Stock.
Ships from and sold by Heart Rate Monitors USA.
One Size Size Chart
  • 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)
81 new 12 used from $57.42

There is a newer model of this item:

View the User manual for the Heart Rate Monitor Watch

$97.00 & FREE Shipping In Stock. Ships from and sold by Heart Rate Monitors USA.

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Color: Black | Size: One Size
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Product Description

Get all the essential heart rate features with this good-looking and simple-to-use training computer. RS300X is compatible with S1 foot pod and G1 GPS sensor, so you can combine heart rate with speed and distance.

Product Details

  • Product Dimensions: 7 x 5 x 3 inches ; 1 pounds
  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • ASIN: B00SB078ME
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (483 customer reviews)
  • Amazon Best Sellers Rank: #72,332 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Product Warranty: For warranty information about this product, please click here

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From the Manufacturer

Smarter Training Starts Here

When you train, you don’t always have to go faster or harder to get the best results. To reach your goals you just need to train within the right heart rate intensity zone.

A heart rate monitor will help guide your training so every workout counts.

Polar RS300X Heart Rate Monitor

Get race day ready with the RS300X. It's packed with essential running features to help you monitor your progress and maximize your training.

  • Helps you train at the right intensity with personal sport zones
  • Compatible with Polar speed and distance sensors (sold separately)
  • Polar Fitness test measures your aerobic fitness at rest and tells you your progress
  • Average and maximum heart rate of each lap
  • Automatic lap recording
  • Time and distance based interval timers
  • Water resistant – 50m (suitable for swimming)
  • Syncs to online training diary with FlowLink (sold separately)

Important Information


Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

269 of 284 people found the following review helpful By mydogplaysthetrumpet on August 28, 2009
Size: One SizeColor: Black Verified Purchase
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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109 of 116 people found the following review helpful By Amazon Customer on May 28, 2011
Size: One SizeColor: Black Verified Purchase
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.
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116 of 131 people found the following review helpful By BB23 on February 4, 2010
Size: One SizeColor: Black
Nobody loves the Polar Brand more than I do. Actually since 1995 I haven't used any other brand. I have always used the basic model to get the largest screen and font. At the White Rock Expo 12/09 in Dallas I purchased the RS300x w/ the foot pod.
Pros: + the foot pod is incredibly accurate, much better than any GPS technology that you can afford
+ nice looking watch / monitor (although I don't use mine as a watch)
+ chest strap will fit smaller chests ( my children can use the new chest strap)
+ heart rate registers without recording so you can read your heart rate prior to or after your run but it doesn't skew your run data.

Cons: -With 3 lines of text on each screen, You cant read the screen during a run. Particularly the tenths of miles. (This blows the whole deal, what's the point of info you can't read)
-too many screens to go through, just overly complicated a good thing.
What is the value of all that information that you can't read during a run. I get home from a run and realize the thing wasn't on.
There should be a way to opt out of some of the bologna. 99% of athletes don't need that info and don't want it.
I still love Polar and I'm still trying to love the RS300 but its not easy. I guess it like buying a book and when you get home you realize the font is too small to read.
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89 of 100 people found the following review helpful By Mike Hayden on September 6, 2009
Size: One SizeColor: Black Verified Purchase
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.
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