Why does the heart rate indication differ from the actual heart rate when using the hand pulse sensors?

11002 CrossPace 5.0 NorsK

How can I measure my pulse?

10000 CardioPace 5.0 NorsK

11003 CrossPace 7.0 NorsK

4855 Cardio Motion BT - Hand pulse sensore cables too short

Are the power stations noisy?

On my Loxon XTR BT, Varon XTR BT, or Exum XTR BT, why aren't the RPMs displayed in the Kinomap app during training?

10002 Speed PRO

4855 Cardio Motion BT

General

66426 Cross Jump

4541 Pro Force

General

Why doesn't my heart rate monitor pair with my fitness device?