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Tijmen
@Nef
Ah right. My wrist optical HRM - a 735 as it is - went a bit bonkers the other day but in the other direction. Started reporting 180+ while out doing some zone 2/3 training. My self check of my pulse on my neck was nowhere near the reported 3 beats a second. It seems like it's been really consistent apart from that though!
One minor thing - the plastic on the HRM on the back of the watch cracked quite a bit, to the point I had to pay for a repair/replacement (£90~). After a bit of research I discovered it was because of the suncream I was using (Riemann P20 or whatever it's called) degraded the plastic because it's thinned with alcohol. Admittedly not a massive problem in autumn/winter, but worth knowing all the same!