The phone can also scan your bicep to determine body fat. But be cautious: there is no perfect method to determine body fat outside of getting a medical body scan in a lab . And you should avoid any batch of pills you're suspicious of anyway, regardless of what a sensor says.
Pricing information for the Changhong H2 hasn't been announced yet, but the standalone sensor cost $250. Add the cost of an Android smartphone and it'll likely be much higher than that. The device will hit China in the first half of this year and the US in late 2017.