Apple Watch Sensor Impacted by Tattoos

By on July 14, 2015


If you are one of the fancy pants people who are getting an Apple Watch right now, be careful that you also do not have a wrist tattoo. It has been found by several users of the schmancy device that one of the device’s features, the heart rate monitor, is affected by certain changes or defects in a person’s skin – such as tattoos.

The sensor uses technology called photoplethysmography, its the skin with green LED and infrared light to monitor the blood flow during and between heart pumps. The tattoo makes it difficult for sensor to get accurate readings.

According to the support page on Apple’s page:

“Permanent or temporary changes to your skin, such as some tattoos, can also impact heart rate sensor performance. The ink, pattern, and saturation of some tattoos can block light from the sensor, making it difficult to get reliable readings.”

There is a bypass. Wearers can connect their Apple watches to an external heart rate monitor via Bluetooth.

About Darth Sarah

Sarah is a journalist and an artist who lives in the city. She loves movies and television. She reads early and often. She also secretly hopes the Doctor will come and take her away, though she realizes he probably already has a dedicated companion at the moment. Sarah also helps out over at, and our other sites!