![Optical Heart Sensor accuracy - why is so bad? - Forerunner 645/645 M - Running/Multisport - Garmin Forums Optical Heart Sensor accuracy - why is so bad? - Forerunner 645/645 M - Running/Multisport - Garmin Forums](https://forums.garmin.com/cfs-file/__key/communityserver-discussions-components-files/124/1321860.png)
Optical Heart Sensor accuracy - why is so bad? - Forerunner 645/645 M - Running/Multisport - Garmin Forums
![Serious problems with Garmin Fenix 6X Pro wrist HR sensor and altitude sensor - fēnix 6 Series - Wearables - Garmin Forums Serious problems with Garmin Fenix 6X Pro wrist HR sensor and altitude sensor - fēnix 6 Series - Wearables - Garmin Forums](https://forums.garmin.com/resized-image/__size/1000x480/__key/communityserver-discussions-components-files/431/Garmin_2D00_HR.jpg)
Serious problems with Garmin Fenix 6X Pro wrist HR sensor and altitude sensor - fēnix 6 Series - Wearables - Garmin Forums
![Totally disappointed with Garmin Fenix 7S optic heart rate sensor accuracy - fēnix 7 Series - Wearables - Garmin Forums Totally disappointed with Garmin Fenix 7S optic heart rate sensor accuracy - fēnix 7 Series - Wearables - Garmin Forums](https://forums.garmin.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/599/_2D00_1_2D00_Garmin_2D00_Fenix_2D00_7_2D00_A_2D00_Scientist_1920_s_2D00_Review_2D00_YouTube.png)
Totally disappointed with Garmin Fenix 7S optic heart rate sensor accuracy - fēnix 7 Series - Wearables - Garmin Forums
![Serious problems with Garmin Fenix 6X Pro wrist HR sensor and altitude sensor - fēnix 6 Series - Wearables - Garmin Forums Serious problems with Garmin Fenix 6X Pro wrist HR sensor and altitude sensor - fēnix 6 Series - Wearables - Garmin Forums](https://forums.garmin.com/resized-image/__size/1000x480/__key/communityserver-discussions-components-files/431/Garmin_2D00_altitude.jpg)