A
test probe pin is disclosed. The
test probe has a plurality of probes, each of which has a probe tip surface coated with a nano-film of conducting
polymer, and the thickness of the nano-film is about 1-20 nm. The probes coated with the nano-film are installed on a
test fixture for testing IC components, so that the probes can efficiently provide excellent no-clean property and stabler electro-
conductivity for lowering the cleaning frequency of the probes, enhancing the yield of IC component testing, increasing the utility rate of the
test fixture, reducing the total testing cost, elongating the usage lifetime of the
test probe, and reducing the cost of probe material. Thus, due to the nano-film of conducting
polymer, the probes made of
metal material can provide almost the same electro-
conductivity as a traditional probe by only plating a
gold layer of one fifth of original thickness, so that the cost of whole probe material can be reduced.