Polar RS300X Heart Rate Monitor Review

The Polar RS300X heart rate monitor is an entry to mid level device from one of the biggest makers of HRMs. While this is classed an entry level monitor, it does come with some features that go beyond the most basic devices available, which is why we refer to it as tending towards mid level.

For less than $90 you obviously get heart rate monitoring, but the watch doesn’t just display the beats per minute. It can also display a percentage of maximum heart rate or an average for a particular work out session. This is very handy if you want to trigger and a certain average on a given day, or vary between certain percentages during one training session.

When you move between heart rate zones the watch will also signal this by way of an audible and visual alarm. This means that you do not have to constantly look at the watch to check what zone you are currently performing in. Being able to focus more on your running than the data itself will definitely help you perform better. Especially when you are starting out with heart rate training you will tend to check the watch on a very regular basis. This can distract when you should be focusing on your running. With a simple warning signal you will know exactly when to increase or decrease your pace.

Polar RS300XOwnIndex is a feature that Polar have built directly into the watch. Over time the watch gains data about your level of fitness and physiological condition. This is then used to recommend the best intensity to train at to help you maximize and optimize every training session. It is like having a personal trainer analyze your performance and give you professional advice. The more data that is collected the more accurate the advice will be.

The Polar RS300X heart rate monitor also tracks the last 16 training sessions, which is something not common on basic heart rate monitors. This essentially allows you to monitor your progress over time, which can be very motivational. 16 training sessions is a very good amount of information, but you should regularly transfer this data to designated tracking system. This will allow you to see your improvements over a much longer period of time and it will give you a much better visual representation.

As you can see in the image the watch has a pretty large face which is great as it clearly displays a lot of data. It has also got a pretty cool design and the buttons are large enough to easily use while you are running.

Amazon reviewers have given this quite a high average rating of 4.1 stars from over 130 reviews. This is a pretty good indication that it has been well received by many customers. Make sure you check out some of the reviews to get an understanding of what people really think abut it, it really is one of the best things you can do before making that final decision.



Detailed heart rate data as BPM, percentage and average

Sleep mode to conserve battery power


Difficult to read while running

No user replaceable battery


Also take a look at this very handy comparison table that we have put together in order to make it easier to see the differences between all the different HRMs.