Smartwatch heart rate sensor inaccurate
4.5
The watch shows unusually high or low heart rate readings during rest or exercise.
Symptoms
- Spiking HR
- Flatline readings
- Delayed updates
Possible Causes
- Loose fit
- Tattoos on wrist
- Sweat buildup
Step-by-Step Fix
1
Tighten the Band
The watch should be snug but comfortable, two fingers above the wrist bone.
2
Clean the Sensor
Wipe the back of the watch with a damp cloth to remove sweat and oils.
3
Switch Wrists
Try the other wrist to see if skin tone or tattoos are interfering.
When to See a Technician
Optical sensors struggle with dark tattoos or excessive arm hair.
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