Which heart rate belt can I use with the devices?

How do I connect the heart rate belt to the fitness device?

3580 Dual Chest

4871 Cardio 5.0

How can I measure my pulse?

4855 Cardio Motion BT - Hand pulse sensore cables too short

4855 Cardio Motion BT

45042 Bermuda

4866 Cardio XT9 BT

4862 Cardio XT6 BT

14035 Autark Smith Machine Multi Lat Seat

4870 Cardio 4.0

75000 Body Screen TX - Inaccuracies during measurement

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

3587 Dual Inner/Outer Thigh