One of our solutions is the VelMIX LC that allows the opening and closing of valves while pouring a beer. In addition, all draft sales are automatically recorded in the Veloce point-of-sale software, which allows you to make daily modification and avoid losses.
You can set the number of ounces in the system. VelMIX LM, is another solution for the draft beer to monitor the sales. The main difference is the that it does not have the closing feature like the valve, but will still accurately record beer sales by portions (glass, pint, pitcher, top off).