Patent ID: 7779551

Claim:
A testing apparatus for testing perpendicularity of an end surface of a workpiece, comprising: an electrically conductive first reference piece configured to be abutted against the end surface of the workpiece, wherein two guide holes are defined in the first reference piece; and two testing units, each testing unit comprising: an electrically conductive trigger piece; an electrically conductive sliding member; wherein the sliding member comprises a testing block, and a touching piece attached to the testing block; the testing block is slidably engaged in one of the guide holes of the first reference piece; and an elastic member; wherein the trigger piece, the touching piece, the testing block, and the first reference piece cooperatively form a testing circuit; at a normal state, the elastic member biases the touching piece to contact the trigger piece to close the testing circuit, and to cause the first testing block to extend out from one of the guide holes to a distance, the distance corresponds to an allowable perpendicularity tolerance.