| CPC G01N 35/1002 (2013.01) [G01N 35/1016 (2013.01)] | 4 Claims |

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1. A test kit, comprising:
a box body (6) having a first side and a second side opposite to the first side, wherein the box body (6) has a circular tube-shaped air inlet (7) at the second side, and the box body (6) is configured for storing reagent inside the box body (6);
a cylindrical liquid discharge tube (8) having a first end and a second end opposite to the first end, wherein the first end of the cylindrical liquid discharge tube (8) is fixed to the first side of the box body (6) and the cylindrical liquid discharge tube (8) is located outside the box body (6);
a circular sealing gasket (9) provided in the cylindrical liquid discharge tube (8) at the second end of the cylindrical liquid discharge tube (8) and fixedly connected to the cylindrical liquid discharge tube (8), wherein the circular sealing gasket (9) comprises a circular liquid outlet (1) extending through the circular sealing gasket (9) along a longitudinal direction of the circular sealing gasket (9);
a solenoid coil (5) surrounding the cylindrical liquid discharge tube (8) and fixedly connected to the cylindrical liquid discharge tube (8);
an annular magnet (2) provided at and fixedly connected to the second end of the cylindrical liquid discharge tube (8); and
a ball (3) and a magnetic rod (4) fixed to the ball (3), wherein the ball (3) and the magnetic rod (4) are slidable in the cylindrical liquid discharge tube (8) between the first end of the cylindrical liquid discharge tube (8) and the circular sealing gasket (9), and the magnetic rod (4) is closer to the box body (6) than the ball (3); and
wherein, when the solenoid coil (5) is deenergized, the ball (3) is in contact with the circular sealing gasket (9) sealing the circular liquid outlet (1) through at least the annular magnet (2).
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