The present relates to a capillary phenomenon, the operating device with a view to indirect experience with the capillarity of the plant of the invention, the first acrylic tube this number set, the first acrylic tube module and, wherein the first acrylic tube and the diameter of the same diameter and length and that the second acrylic tube module is different from the first acrylic tube is a number set length, and the first water tank in which the first acrylic tube module is upright installation, and the second tank in which the second acrylic tube module is upright installed, the a first solution tank of the first solution is stored with the first color is supplied to the first tank, and the second solution tank wherein the second solution with the first color different from the first color to supply the second tank is stored, wherein a first acrylic tube such that the first solution at a first height of fill in the module supplies a first solution and the first solution injected into the discharge device for suction both a first solution supply after a predetermined time, said first liquid injecting and ejecting device and a first pump for supplying the first solution when supplying a first solution to the first acrylic tube modules to the first tank, the first solenoid valve are provided, said first liquid injecting and ejecting device of the first acrylic when the absorption of the first solution in the tube module in a first solution tank a first liquid for recovering a first solution tank, the first solution in the open, the first solenoid valve of the first water tank baechulgwanwa, in the second acrylic tube module a second liquid injecting and ejecting apparatus for supplying a second solution 2 solution is so filled with a first height and a second different height and suction both a second solution supply after a predetermined time, the second liquid injecting and ejecting unit is the second acrylic and second pumps to supply the second solution to supply the second solution to the second tank to the pipe module, is provided a second solenoid valve, the second liquid injecting and ejecting unit is the second acrylic tube when the absorption solution from the second module in the second solution tank is configured to include a second fluid outlet pipe for recovering a second solution to the tank is open and the second electromagnetic valve the second solution in the second tank.