Here is a smart scale that connects to your phone and tablet and provides you with instructions to mix drinks. The Perfect Drink Pro scale lets you choose from over 400 cocktail recipes or create your own drinks. Just place your shaker on the scale and pour. Perfect Drink not only adjusts your recipes if you over-pour, it can suggest cocktails based on ingredients that you have.
Perfect Drink Pro is made of stainless steel and melamine. Costs under $100 at this time.