Polar RS300X Heart Rate Monitor Review

The Polar RS300X is a heart rate training watch for the recreational athlete who is looking for all the essential heart rate and timing features that a heart rate trainer needs to train at the right intensity during their cardio workouts.


Shop for Polar RS300X Heart Rate Monitor.


To start using your Polar heart rate monitor, you should perform the 5-minuet Polar Fitness Test. This test measures your aerobic fitness level at rest and calculates your personal OwnIndex by evaluating your maximal oxygen uptake or VO2max. This test can be performed by you and automatically defines our OwnIndex without any exertion. The Fitness test is based on heart rate and heart rate variability at rest as well as personal information that you supply. It is as accurate in predicting the VO2max as any sub maximal fitness test.


Polar RS300X Body Measurement Features

  • Automatic age-based target zone – bpm (beats per min), % MHR (max heart rate), % HRR (heart rate reserve)
  • Average and MHR of each lap
  • Average, minimum and MHR of training
  • Heart rate (HR) – bpm, % MHR, % HRR
  • HR-based target zones with visual and audible alarm
  • HRmax (age-based)
  • HRmax (Polar Fitness Test-based)
  • Manual target zone – bpm, % MHR, % HRR
  • Polar Fitness Test
  • Polar OwnCal – calorie expenditure
  • Polar OwnCode – coded transmission
  • Polar Own Zone – personal heart rate zone
  • Polar sports zone


Polar RS300X Training Features

  • Automatic lap recording
  • Display zoom
  • Graphical target zone indicator
  • HeartTouch – button-free operation
  • Interval trainer guided workouts
  • Number of laps – 99
  • Time and distance based interval timers
  • User configurable displays – two lines
  • Zone lock
  • ZonePointer


Polar RS300X Watch Features

  • Backlight
  • Date and weekday indicator
  • English, German, French and Spanish
  • KeyLock
  • StopWatch
  • Time of day (12/24h) with alarm and snooze
  • User replaceable battery
  • Water resistant – 50m

All Polar heart rate monitors come with a 2-year warrantee that guarantees their products to be free from defects in material or workmanship from the date of purchase. This warrantee only applies to the original consumer of the heart rate monitor.

Optional Accessories

Polar S1 Foot Pod
For accurately measuring your running speed, pace and distance, Polar makes the S1 Foot Pod, which is compatible with the RS400. Just attached it to your shoelaces like a race chip, and this shock and water resistant sensor will feed information directly into your heart rate monitor.

Polar G1 GPS Sensor
A RS300X compatible sensor that you wear on arm to measure speed, pace and distance in various outdoor sports

Polar FlowLink

Your up-link that allow you to transfer your monitor’s training files into your online training log at polarpersonaltrainer.com

For more information click here Polar RS300X Heart Rate Monitor.

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