When mixing voicing liquids consistency, and the ability to achieve desired ratios is imperative.  Often, this requires measuring and division to understand how much of each part to add to the solution.  This simple yet elegant device takes all of the math and measuring out of the equation. You simply set the large size to the amount of solution you want to make and the small side tells you how much harder to add. The kit comes with common ratios of 3:1, 4:1, 6:1, and 8:1