COROS PACE 3 : Scientific Review

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Timestamps:
00:00 Intro
01:15 Quick Specs of the COROS PACE 3
04:22 Heart Rate Test 1 : Indoor Cycling
09:32 Heart Rate Test 2 : Outdoor Cycling
12:56 Heart Rate Test 3 : Running Outside
14:42 Heart Rate Test 4 : Weight Lifting
17:36 GPS Test
21:58 Sleep Stage Initial Test 1 : EEG comparison
27:56 Sleep Stage Initial Test 2 : Compared To Other Smartwatches
29:52 Limitations
30:34 Conclusions

In this review we will test the new Coros Pace 3. The successor to what is probably the most popular watch that Coros made so far, the Pace 2. In this video we will focus on systematically testing the heart rate tracking performance, GPS tracking accuracy and we will also take a look at the sleep stage tracking, so you can decide if the Coros Pace 3 is the watch for you. And, I have to say, I was pleasantly surprised by the performance of this lightweight and relatively affordable watch from COROS. Let’s get started!

Let’s start with the design. The PACE 3 is marketed as a very lightweight watch, weighing 30 grams with a Nylon band and 38 grams with a Silicone band. This means it is very lightweight, but still about a gram heavier that the Pace 2 , which weighs in at 29 and 36 grams for the Nylon and Silicone band variants respectively. The band width of Pace 3 is 2 mm wider at 22mm compared to the Pace 2’s 20 mm. But these are relatively small details, a bigger change is the addition of a touch screen to the Pace 3, which was not part of the Pace 2. The 1.2 inch touch screen display includes an always-on mode and a night mode.
But, what is far more important to me is the sensor set. The Pace 3 includes the next-gen HR sensor, with 5 LEDs, 4 photodetectors, whilst still having a slightly reduced casing size compared to the Pace 2. It now also includes an SpO2 sensor for blood oxygen tracking, which the Pace 2 did not have, and importantly the satellite chipset was also changed. The Pace 3 supports all five satellite systems, but the major improvement is that the Pace 3 now supports L1 + L5 dual frequency while the Pace 2 didn't. Just to very briefly explain what this means: L1 is more or less the standard frequency used by most smartwatches. However, this single-frequency data can be affected by atmospheric distortions, leading to inaccuracies. The ability of the Pace 3 to also use the L5 frequency means it has access to additional satellite signals that help correct the inaccuracies stemming from atmospheric effects on L1 signals. In essence, using two frequencies reduces the error rate and offers users more precise location tracking and thus theoretically more accurate data for speed, distance, and route during any activity.