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Polar M21 Heart Rate Monitor


  • Average Rating: 3.25/5
  • # of Reviews: 4

Product Description

  • OwnZone™ - provides automatic intensity guidance with blinking and sounding alarm OwnCal™ - automatically determines your calorie usage
  • Exercise Reminder - three days after the last exercise session displays a gentle text message every full hour
  • Last exercise file - shows your exercise date, exercise time, time in the zone, average heart rate, fat consumption estimate, calories burned, total calories burned, and total exercise time
  • Calorie indicator - a bullet to indicate every consumed 100 calories.
  • Heart rate monitoring
  • Heart Rate Limits
  • Heart touch - a hands-free way to activate the backlight
  • Watch, alarm, calendar, weekday indicator and stopwatch functions
  • Water resistant to 30 meters.
  • Coded wireless transmitter that prevents cross-talk with other monitors (Note: In the USA and Canada this product is sold with uncoded Polar Transmitter.)


  • Review Options:  Sorted by Latest Review | Sort by Best Rating

    Reviews 1 - 4 (4 Reviews Total)

    User Reviews

    Overall Rating:5
    Value Rating:5
    Submitted by Janet Adams a from UK

    Date Reviewed: April 5, 2007

    Strengths:    Very Good all round

    Weaknesses:    Has none for me

    Bottom Line:   
    Fab... Fab... Fab... use it 3-5 time a week in the gym. Had it now for 9 years still going stong . Best buy, well worth the money i paid for it.Wouldnt be without it.shame I cant hook it to my pc. Then again it is 9yrs old.
    Good on you polar keep up the good work.

    Expand full review >>

    Duration Product Used:   More than 3 years

    Price Paid:    $220.00

    Similar Products Used:   none



    Overall Rating:1
    Value Rating:1
    Submitted by Blue a Cross Country Rider from Colorado

    Date Reviewed: April 20, 2004

    Strengths:    I like the calorie function. I set a point in the ride that my training ends and I start earning beer.

    Weaknesses:    Durability

    Bottom Line:   
    I have had terrible luck with the durability of this HRM. It used to work fine while climbing, but blank out and lose all info during rough descents. Now, it blanks out anytime I try to change the display. It probably would have been fine for road riding, but that's not what I do.

    Expand full review >>

    Favorite Trail:   Too Long

    Duration Product Used:   2 Years

    Purchased At:   Gift

    Similar Products Used:   none

    Bike Setup:   Klein Palomino, mostly stock.


    Overall Rating:3
    Value Rating:4
    Submitted by Bubbles Esq. a Weekend Warrior from Sherwood Forest - (burb of Edmonton)

    Date Reviewed: May 28, 2003

    Strengths:    This heart rate monitor is pretty durable. I hit a sign the other day doing about 30kph and the wrist piece took a direct hit and didn't break. The strap popped apart but that was easy to fix. While I'm riding I have it showing my current HR, and I can pace myself to keep my heart rate where I want to. At the end of the ride,I look at the file and I can see what my average HR was and exercise time.

    Weaknesses:    The wrist piece isn't too fancy looking. Sometimes the telemetry strap slips but that's mostly due to the V-shape of my upper body!!!!!

    Bottom Line:   
    If you want a HR monitor that gives you the basics and won't break the bank, this is the one. If you need your speed and wattage etc. your going to have to spend a lot more money.

    Expand full review >>

    Favorite Trail:   Anything Fast

    Duration Product Used:   3 months

    Price Paid:    $100.00

    Purchased At:   Running Room

    Similar Products Used:   None

    Bike Setup:   Dekerf Generation Cromoly Hardtail / Norco VPS Shore


    Overall Rating:4
    Value Rating:4
    Submitted by Pablo a from Houston, TX, USA

    Date Reviewed: May 27, 2002

    Strengths:    Durability, customized calorie-burning info, ease of use

    Weaknesses:    Weight, compared to similar models

    Bottom Line:   
    Easy to use, reliable hrm. Only problem is that my girlfirend has an older Polar hrm model, and my hrm will pick up both of our heart rates. Otherwise, a great hrm.

    Expand full review >>

    Duration Product Used:   6 months

    Price Paid:    $110.00

    Similar Products Used:   None




    Reviews 1 - 4 (4 Reviews Total)

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