What fitness tracker do you use?

TIME

Activity monitors used to be tools that only scientists used during research, but the fitness-tracking industry, which is projected by analysts to be a $19 billion business by 2018. But how accurate are they really?

In a new study from Iowa State University published in the journal Medicine & Science In Sports and Exercise, researchers assessed how well they actually work. To test the products, 30 men and 30 women wore eight popular monitors during a 69-minute workout that included exercises like Wii tennis, running, and playing basketball. They also wore a medical-grade metabolic analyzer for comparison. The researchers found that some devices were pretty accurate, with estimates within 10 to 15% of precise calorie burn.

Here’s their list, ranked from most to least accurate:

1. BodyMedia FIT performed best with a 9.3% error rating. The researchers say this device has a similar accuracy to devices used in…

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