As Bluetooth has become ubiquitous, it's been added to more and more devices. Coupled with frameworks such as Apple's HealthKit and Fitbit's family of APIs, hardware makers in the health and well-bing business can now take what used to be a disconnected device and easily hook it up to a smartphone app that can use the data in interesting ways. Smart scales, like the Renpho Digital Scales are one such device. But, unlike most of the other similar devices on the market, they do this at about a quarter of the price of their competitors.