with the probe pin 160 by compressing the printed circuit board 120 in the barrel 114 either in the direction of or in the opposite direction of the probe tip 110 relative the barrel 114 with further reference to fig4 in the preferred embodiment the probe socket 150 comprises a substantially cylindrical barrel structure 151 with a coaxial bore 152 formed therethrough in the preferred embodiment the coaxial bore 152 of the probe socket 150 hereinafter u201c probe socket bore 152 u201d comprises a conical probe socket bore section 153 a first equi diameter probe socket bore section 154 and a second equi diameter probe socket bore section 155 the conical probe socket bore section 153 forms a bore having a diameter gradually decreasing from a maximum diameter opening at one end 156 of the probe socket 150 to a minimum non zero diameter opening into the first equi diameter probe socket bore section 154 preferably in order to ensure maximum electrical contact the diameter of the first equi diameter probe socket bore section 154 substantially matches or is only slightly greater than the diameter of the contact spring wire 130 in the preferred embodiment the diameter of the first equi diameter probe socket bore section 154 is approximately 10 mils the first equi diameter.