Heart rate is wrong in 2km first!
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 Had the same experience too. Have a Ssu and have to use hr belt. If you want a precise measurement use a hr belt. I had 2 suunto hr belts and - excuse me - they are rubbish. Suunto can’t that. So I bought a H10 and I’m pretty satisfied. No problems at all. It’s worth the money if you want reliable hr data 
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 @Stefan-Kersting there are new belts and improved ones though. If you still have a warranty ask for a replacement. They are white on the sensor buckle. 
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 @Dimitrios-Kanellopoulos ok then my comment applies just the older ones. Don’t have experience with the new ones. I don’t have warranty any more but happy with the polar  
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 @Stefan-Kersting I know pal, just saying  
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 New belts have a different problem, they evaporate quickly from suunto store. 
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 @lexterm77 yes and manufacturing is slow due to Corona. Difficult times for EU factories etc 
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 I bought two just in case this coronaverse shit hits the fan. 
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 @jw-cou I tried as your idea but the first 2km heart rate was still wrong 
  
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 @hieus I’ve no other option to suggest, sorry  
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 @hieus 
 I have not read all advices you got, but eventually try to wear your watch on the other wrist. Maybe blood flows are better.
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 @Mff73 This afternoon, I wore a watch on my right wrist and the problem was solved. 
 Thank you all!
 
 




