The utility model provides a capacitance meter special test fastener belongs to electric capacity test wire field, including " C " type piece, " C " includes the riser, goes up diaphragm and lower diaphragm, upward is equipped with the double -screw bolt on the diaphragm, and lower diaphragm upper surface is equipped with precision measurement hypophysis, and the lower surface is equipped with rapid survey hypophysis, and the riser outside is equipped with the handle, can not damage the condenser casing head, but the capacitance of accurate measurement condenser.