These pneumatic specimen grips for maximum tensile forces up to 1 kN are suitable for use in determining the insertion and connecting forces of catheter tube systems and can also be used for testing flat specimens made of metal, plastics, paper or foils. The single-actuator grips are closed by means of a foot pedal, leaving both hands free for fixing the specimen, while the closing force is infinitely adjustable via a pneumatic control unit. The low build-height of the specimen grips allows optimum use to be made of the test area of the materials testing machine and Zwick has available a comprehensive range of jaws for widely differing applications.