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Apple watch reportedly had a problem with hairy wrists

February 17, 2015, 7:45 PM UTC
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CUPERTINO, CA - SEPTEMBER 09: Apple CEO Tim Cook talks about the Apple Watch during an Apple special event at the Flint Center for the Performing Arts on September 9, 2014 in Cupertino, California. Apple unveiled the Apple Watch wearable tech and two new iPhones, the iPhone 6 and iPhone 6 Plus. (Photo by Justin Sullivan/Getty Images)
Photograph by Justin Sullivan — Getty Images

This post is in partnership with Time. The article below was originally published at Time.com.

By Dan Kedmey, TIME

Apple (AAPL) has reportedly scaled back ambitions to embed cutting edge health sensors in its smart watch, as stray arm hairs and dry skin confounded the readings for some wearers.

Insiders at the company told the Wall Street Journal that the company shelved a sensor that would have monitored heart rates using electrocardiogram technology. The sensor reportedly produced less than reliable readings when placed against hairy or dry skin, or if the wearer strapped it too tightly against the wrist. Engineers also struggled to get a reliable reading of stress levels by gauging sweat on the skin.

Apple Watch is slated for an April release, marking the first time that Apple will attempt to create an entirely new category of electronic devices since the 2010 release of the iPad. The device maker has reportedly ordered upwards of 5 to 6 million units in anticipation of the release date, according to parts suppliers in Asia.

Read more at the Wall Street Journal.