Abstract: Provided is a probe card, comprising a guide plate and a shielding structure of single-layer or multi-layer. The guide plate comprises an upper surface, a lower surface, and at least one guide hole passing through the upper surface and the lower surface, and the guide hole is provided with an inner wall surface. At least one layer of the shielding structure is made of an electromagnetic absorption material or an electromagnetic reflection material, and the shielding structure is not connected to a ground. Each layer of the shielding structure is formed on the inner wall surface of the guide hole by means of atomic layer deposition or atomic layer etching, and a thickness of each layer is less than 1000 nm.

Abstract: A mixer includes a mixer housing provided with two annular skirts respectively extending downward to form a receiving space for communicating with an interior of the tubular housing, a mixer element having a helix extending into the tubular housing, and a mixer inlet portion with a connection plate having two top openings selectively communicating with the two openings such that components received inside the two tubes are able to be selectively forced into the interior of the tubular housing for dispensing.

Abstract: A mixer includes a mixer housing provided with two annular skirts respectively extending downward to form a receiving space for communicating with an interior of the tubular housing, a mixer element having a helix extending into the tubular housing, and a mixer inlet portion with a connection plate having two top openings selectively communicating with the two openings such that components received inside the two tubes are able to be selectively forced into the interior of the tubular housing for dispensing.