The object is a World War II instrument produced for the U.S. Navy and designed to test vacuum tubes used in naval electronics. The object has a built-in chart which identifies the various tube types used at that time with instructions for setting up this instrument to test them. The object includes 12 12" jumper cables with banana plugs on each end. Attached to the object is a fused power cord. The object includes a JAN-CKR-CJ5 vacuum tube manufactured by KEN-RAD.