By now we are all used to having our Heart Rate Monitors baked into our watches, and they are pretty accurate most of the time. But if you want better accuracy during your workouts.

Then your only other option would be to get yourself a heart rate chest strap. HR chest straps aren’t as comfortable as having something just sit on your arm. But for the longest time that was the only option.

On top of that, some of us are happy with our older model wearables that don’t come with inbuilt HRM, like a Garmin Fenix 3. It does its job, and there’s no pressing reason to get a brand new device, when the one you have is in perfectly good condition.

Also if your triathlete or you want one that works while swimming, then you need to fork out a pretty hefty amount for a multi-purpose strap.




Now Polar has come out with a third option. The OH1 is an optical heart rate sensor that can be worn around your upper or lower arm. It can capture 200hrs of heart rate activity and is accompanied by Polar’s Beat mobile app. The OH1 can even be used for swims as its waterproof up to 30m.

Polar has worked hard to make the OH1 comfortable to wear and use. The sensor is small, and the textile arm band is soft, so it feels natural on your arm, and you may even forget that it is even there. To get it cleaned, the strap is machine washable.

Unlike chest straps where you need to moisten the strap for an accurate read. The OH1 can be used straight up as it uses LED lights and a light-detector to measure the changes in the size of blood vessels and turns these measurements into heart rate readings.

Whether you’re a runner, triathlete or a bodybuilder, the OH1 will track your heart rate and show you just how much you’re pushing yourself.


Here are some quick specs for the Polar OH1:

  • 6-LED optical heart rate sensor
  • Optimized for wear on lower or upper arm
  • Bluetooth Low Energy
  • Waterproof: 30 m
  • Updatable software Via Polar Flow
  • 4 MB of Internal memory for up to 200 h of HR training
  • Operation time: 12 h (USB rechargeable 45 mAh lithium polymer battery )
  • Works as both a standalone sensor and when connected to Polar products or a smartphone
  • iOS mobile devices: iPhone 4S and later; Android mobile devices with Bluetooth 4.0 capability and Android 4.3 or later. 
  • Weight: Sensor 5 g, armband 12 g
  • Height: 9.5 mm
  • Diameter: 29.85 mm
  • Armband size: M-XXL
  • Strap: machine-washable

MSRP S$ 129.00

You can find out more here.


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