Resistor test probe

Claim 1

A PORTABLE HAND OPERATED RESISTOR SHEET TEST PROBE COMPRISING A HANDLE HOUSING MEANS FOR INSULATING MATERIAL HAVING WALL MEANS DEFINING A CENTRAL CYLINDRICAL CAVITY OPEN ON AT LEAST ONE END, FIRST SHOULDER STOP MEANS ON SAID WALL MEANS ADJACENT THE SAID ONE END OF THE CAVITY, FIRST MOVABLE ANNULAR CONTACT MEANS CONCENTRICALLY DISPOSED WITHIN SAID CAVITY AND HAVING A FIRST PORTION EXTENDING AXIALLY BEYOND THE END SURFACES OF THE WALLS THEREOF, AND A SECOND PORTION DISPOSED IN RETAINING ENGAGEMENT WITH SAID SHOULDER STOP MEANS, SECOND SHOULDER STOP MEANS ON SAID FIRST CONTACT MEANS, FIRST BIASING MEANS BIASING SAID FIRST CONTACT MEANS SECOND PORTION AGAINST SAID FIRST SHOULDER STOP MEANS WITH A FIRST PREDETERMINED FORCE, SECOND MOVABLE CONTACT MEANS MOUNTED CONCENTRICALLY WITHIN SAID FIRST ANNULAR CONTACT MEANS FOR MOVEMENT BOTH THEREWITH AND RELATIVE THERETO, THE END PORTION OF SAID SECOND CONTACT MEANS EXTENDING AXIALLY BEYOND SAID FIRST CONTACT MEANS, INSULATING MEANS CONCENTRICALLY DISPOSED INTERMEDIATE SAID FIRST AND SECOND CONTACT MEANS AND IN ENGAGEMENT WITH SAID SECOND SHOULDER MEANS AND FIXED TO SAID SECOND CONTACT MEANS FOR MOVEMENT THEREWITH, SECOND BIASING MEANS COAXIAL WITH FIRST BIASING MEANS AND ENGAGING SAID FIRST CONTACT MEANS AND SAID INSULATING MEANS AND THEREBY BIASING SAID SECOND CONTACT MEANS IN THE SAME DIRECTION AS SAID FIRST CONTACT MEANS, SAID SECOND BIASING MEANS OPPOSING SAID FIRST BIASING MEANS BY A PREDETERMINED FORCE LESS THAN THE PREDETERMINED FORCE OF SAID FIRST BIASING MEANS, BOTH OF SAID FIRST AND SECOND CONTACT MEANS TERMINAL ENDS BEING FORMED WITH A CIRCULAR SHARP EDGE LOCATED OUTSIDE OF SAID HANDLE HOUSING MEANS TO PROVIDE GOOD ELECTRICAL CONTACT WITH A WORKPIECE TO BE TESTED, AND ELECTRICAL LEAD MEANS ASSOCIATED WITH EACH OF SAID FIRST AND SECOND CONTACT MEANS.