How #tattoogate has highlighted a wider problem with wearables

Reports that tattoos prevent the Apple Watch's heart rate monitor from working are far from being unique to Apple, but as wearables go mainstream so will their failings

The launch of the Apple Watch has brought a whole new level of attention to wearable tech and in the process is exposing an issue with one of the technologies at the, er, heart, of many wearable devices.

Tracking your heart rate - be it out of curiosity as you sit at your desk, or as a useful tool in exercises regimes - is one of the key features pushed by the Apple Watch as well as other wearable devices.