"K-PEN PROBE, STRAIGHT; 20.0 MHZ. FREQUENCY; WITH INTERCHANGEABLE DELAY TIPS THAT ARE TAPERED TO A 0.065 IN. AND 0.090 IN. CONTACT DIA.; REMOVABLE HANDLE ALLOWS IT TO BE USED AS A FINGERTIP PROBE; WITH MICRODOT CONNECTOR; SINGLE ELEMENT CONTACT FOR GENERAL PURPOSE MANUAL ULTRASONIC INSPECTION WHERE TEST MATERIALS ARE FLAT AND SMOOTH"