VacArt Smart Twin is a state of the art dual syringe developed by Meddit B.V.. It can simultaneously inject two kinds of liquids with the same, or differenge dosage. Its unique advantages are: The dosage on the two barrels are adjustable independently, which means that you can inject two kinds of liquids with the same or different doses. For example, Smart Twin 2+2ml BM can inject any dosage from 0.1ml~2ml for each barrel (+0.1ml increment), which make it flexible for different dosage combinations. Two ways of connecting the bottle: bottle mount or tube feed (with bottle mount or hose adapter). The distance between the needles are adjustable (with additional accessories), or combined into one (by a 2-in-1 luer lock) to meet specific needs.