An apparatus and a method are disclosed herein. The apparatus includes a circuit board, a housing, a spacer and a pin. The circuit board is configured to test a device-under-test (DUT). The housing includes a raised portion and a supporting portion. The spacer is mounted on the supporting portion of the housing. The pin penetrates through the raised portion and the supporting portion of the housing, and is configured to electrically connect the circuit board to the DUT.