Victoria Arduino Venus Espresso Machine 3 Groups The volumetric dosing feature allows the barista or operator to program the dose, often allowing for different doses on different group heads. This means the barista can start the brewing process knowing that the machine will automatically finish it with the pre-programmed dose. The manual dosing button starts and ends the brewing process. Cold touch lever: The machine is equipped with a cold touch feature, which significantly reduces the temperature of the steam and water arms during the steaming process. This eliminates the risk of burns to the barista's hands and reduces the time it takes to clean the arms. Double pressure gauge: This gauge makes it easier than ever to check pressure profiling patterns at nine bars, knowing that this machine is a rare production with only 100 units made. This is number 30.