Out of the box, the iHealth HS3 Wireless Bluetooth Scale ($70) is somewhat impressive. With its digital (albeit not backlit) display and snazzy looking-glass top, this is a scale that will at least look spiffy in your bathroom when company is over. Even in the box, the scale makes a good case for gadget adoption: It promises to keep track of your weight, calories and exercise easily using only the scale itself and an accompanying app that can be used on your iPhone or iPad. Technically, the iHealth Scale does do that, but there are a few kinks that make this product’s promises fall flat.