| CPC G01R 1/0466 (2013.01) | 16 Claims |

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1. A test kit for testing a device under test (DUT), comprising:
a socket structure, for containing the DUT; and
a plunger assembly detachably coupled with the socket structure, wherein the plunger assembly comprises a multi-layered structure comprising a nest and at least an interposer substrate installed under the nest, wherein the socket structure comprises a socket housing and an annular socket base secured to an upper surface of an annular perimeter structure of the socket housing, wherein the annular socket base surrounds perimeter of the interposer substrate.
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