The evolution of the Garmin HRM started off with the basic HRM that only read HR. Then the HRM-Run came along that offers reading of Running Dynamic that return even more data to the users. The HRM-Run was the "gold standard" for Garmin until the HRM-Tri came about, because triathletes love their data and wanted to know how their HR is like while swimming (Running Dynamic is available in Tri). In case you missed it, HRM does not transmit inside water. HRM-Tri solve this with the ability to store HR data while it's not transmitting to the watch/device, and sync once you are out of water. Then, in January 2020, the HRM-Dual were introduced, which brought in both ANT+ and Bluetooth connectivity. This essentially allowed for greater connectivity across many different devices - and this include treadmills.
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Dual Transmission ANT+ and Bluetooth
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However, the HRM-Dual do not have the Running Dynamic of Run/Tri nor the ability to store data like the HRM-Tri. In come the HRM-Pro, which put all of these features together in a (Garmin Malaysia Retail Price of) RM620 strap.
Packaging of Garmin HRM has never actually changed for a long time. While my HRM-Run came with the Fenix3HR that I got almost 4 years ago (bundled), the HRM-Tri came in the same sized box as HRM-Pro. There is only one printed side at the back with more descriptions.
Comparing this strap to HRM-Tri makes a lot more sense as they are technically built the same way. Obviously when compared to the older HRM-Run, it is a major upgrade in terms of material quality, comfort and fitting. However, unlike the HRM-Run, the transmitting unit is fixed to the strap and can't be removed. So, if the strap doesn't outlast the transmitter, it will be an expensive replacement, vs being able to buy just the strap (either original or 3rd party).
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| HRM-Pro in green and HRM-Tri in blue |
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| What is on the strap of Pro and Tri - with differences in name, and symbol of ANT+, and Bluetooth |
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| Absolutely no differences in material, finishing and quality |
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| Same for the other receptor side |
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| Even the hook, the same |
If there is one difference i can recall, was that the HRM-Tri came with an extender to allow for usage beyond 42inches chest girth. HRM-Pro doesn't provide this as additional. Perhaps the feedback from users that it was never needed for most that were using it. So, if you have wider chest girth, and need the extender, do check on the availability with Garmin when you plan to purchase this.The unit, like the HRM-Tri, is water resistant to 50m or 5ATM. Unlikely to create any issue if you are using it for open water swim, or if you are using it for diving in a recreational dive (up to 39m depth), and obviously would not work if you are into free-diving or diving deeper than 50m depth. The working temperature is between -10DegC to 50DegC, which may not be applicable for many of us in Malaysia where I am. Taking all these into consideration, there is no issues for me specifically to use this unit in Malaysia, and generally for most of the folks unless they are doing extreme temperature/weather sports.
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| Linked via Bluetooth and ANT+ |
Work Out Of The Box
Pretty straight forward and you can do it via the Setting -> Accessories/Sensor - >Add New function. If you have any issue to link them, i suggest you disconnect it from Bluetooth and the Garmin App for the initial pairing.
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| On the Fenix 6, press the left middle button and scroll to Sensors & Accessories |
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| Pretty straight forward |
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| Add New |
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| You can Search All Sensors or scroll to External Heart Rate |
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| I rather the device work harder 😋 |
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| Once found, just select to Add |
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| Done, easy peasy lemon squeezy |
Usage during activity
The HRM-Pro function just like the HRM-Tri and HRM-Run (stating them both only as these are my only other experience within past 4 years moving from basic HRM, to Wrist HRM). The reading is stable and smooth. Running Dynamic reading is as expected. Accuracy wise seems consistent with my usage of HRM-Run, HRM-Tri and Running Dynamic Pod.
Remember to allow the sensor to pair up before pressing START. It usually will link up pretty fast unless your skin is dry. Nothing some water can't solve. In Malaysia, we do not have such issue due to our high humidity level. Once you are ready to go (aka Satellite locked and all sensors ready to go), it will start recording at the press of Start.
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| Snapshot of my interval run using HRM-Pro (first use) |
When compared to the run I did using the HRM-Tri, the build up and consistency is similar. No spikes or irregular readings. |
| Snapshot of the earlier interval run using HRM-Tri (most recent) |
When it comes to Running Dynamic, the data is the same as using the HRM-Tri as with the HRM-Run. The HRM-Pro as expected gave reading for the respiration as well as long as your device, in my case, the Fenix6 Pro Solar, supports it.  |
| HRM-Pro data |
vs HRM-Tri.
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| HRM-Tri Data |
How much really does the data differ if you are using just the Wrist-based HRM? Not much if you are looking at average, but quite significant if you are looking at spikes and fluctuation. These are normal as the sensor has limitation due to color of skin, sweat and overall fitting of the device over your wrist. Should you be critical of these data? I would say not really if your workout is classified as "easy" and almost running by feel (can talk, sing).
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| Notice the spike and fluctuation without a chest HRM. Running Data possible with Running Dynamic Pod |
And without the chest HRM, the device would not be able to read your respiration rates. |
| Running Dynamic is possible as I am using the Running Dynamic Pod |
As you can see now, the usage of chest HRM for me is only when I am doing more demanding run (tempo, interval, race, and above), as I would want to be as accurate as possible to detect any changes to my Maximum HR, my Lactate Threshold HR and my Lactate Pace. All these help me to plan and shape my training more solidly for self-improvement.
Usage as standalone HRM-Pro
I am sucker for data. Whenever my Fenix6 Pro Solar is being charged, I use my Fenix5x Plus to record my HR and steps primary. Now with the HRM-Pro, i have the option to just use it for this purpose while my Fenix6 is being charged (typically within 2-hours to full charge). The ability of the HRM-Pro to keep/save data and sync on the Garmin Connect app got me intrigued and so, i wore it while watching TV last Saturday evening.
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| There are gaps in the data! |
I realized there are gaps in the reading and it occurs to me those were the time the HRM-Pro went to sleep due to no Bluetooth connection to the phone (and hence Garmin Connect app) as I left my phone to charge and out of the BT range. but when it is in range like post my evening walk, dinner, and post phone connection/in-range, it showed records.
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| Lazy TV time on Saturday evening with ZERO movement. HRM-Pro not connected to Phone (out of Bluetooth range) |
Not happy with the outcome because I want to be certain the HRM-Pro does what it is supposed to do aka record off-device, today (August 16), i decided to test the connectivity again while my device is being charged from 40%. I put on the HRM-Pro and it recorded like charm while linked to the Garmin Connect app via Bluetooth. Using it exclusively without the Fenix6 on my wrist (for a moment i was having device-separation anxiety as now i don't get my SPO2 reading, but in the name of this review, it's a small sacrifice i am making 😏)
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| HR with Movement. I stand at work, often stretch while standing. |
So, i guessed the HRM-Pro does what it is supposed to do if it is off the Garmin device. Only caveat is if your phone with active Bluetooth and Garmin App is running in the background. I won't worry too much about the battery life (of the phone of strap) if you are more inclined to record everything. But do know that there are limitation and it is the active connection and in-range of these to communicate outside of your active Bluetooth connection when you are not doing any activities.
So how do the HRM-Pro then detect your data if you are not wearing your watch, or has it paired to your phone while you were doing activities (like swim, run, bike, martial art, soccer, basketball etc?). This is where this one step is important. Do remember that the HRM-Pro has no ability to create a workout automatically, it takes the prompt from the device it is linked to.
Before you start your activity, you have to make sure the HRM-Pro and your device is paired up and recognized before you press START (example like activating it as as activity; RUN, BIKE, SWIM, CARDIO, HIKE, HIIT). Then the HRM-Pro will know that it need to start storing and recording your data san the watch or the device is transmitting without any receiver (device), like when you swim with the HRM-Tri. And once you are near/connected to the watch again, it will download the data (like the HRM-Tri).
This explain why no data were recorded when you were not doing any activities and not connected to your phone, like when i was just wearing it to watch TV on a lazy Saturday evening.
Care for your HRM-Pro
Having the experience of using different HRM-straps from the most basic to this most advanced model, the care for the HRM-strap is easy. While the older units allow the transmitting unit to be separated from the strap, the newer one doesn't do that. The documentation can be found here.
The rule of thumb with HRM strap are:
- Avoid machine washing the straps
- Hand rinse in cold water after every use as you just want to remove salt (from sweat)
- Hand wash once every 7-usage, or if you use them once a day, that is once a week.
- If you are using it for pool (chlorinated) swim, wash it with mild detergent after every use.
- Use only mild detergent, or just tiny amount of washing, soap, shower gel
- Air dry indoor by hanging it on the loop
- Do not roll it up when storing. Store flat.
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| very straight to the point use that even my kids can understand |
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| Extra care if you intend to use the strap in chlorinated pool |
Summary
The HRM-Pro is in my opinion, the buffed up version of HRM-Tri with additional ability to link via Bluetooth and be used for off-device activity, including being used for tracking when not doing any activity. Designed for the Garmin ecosystem, the additional Running Dynamic doesn't work outside of the Garmin device realm. So, if you are planning to use this with just your Strava or linked to your Virtual Running (Zwift), it may end up as a very expensive option. However, if you are already on the Garmin ecosystem, with the compatible devices, you can maximize the function of the HRM-Pro.
In the table below, you will see each of the HRM and their features. If you are currently using an older HRM from Garmin, and want something as an upgrade suitable for your need, look no further that getting one that will maximise your training. I will update here or create a new one from time to time if anything changes from the existing usage - I do not foresee needing a battery change anything sooner that the next 6-months for now.
