In conducting constant stress creep tests of ductile metals means must be provided to alter the applied load in response to changes in specimen geometry. Over the years a variety of automatic devices has been developed which compensates for the limited range of geometrical change usually encountered. Interest in superplastic metals exhibiting homogeneous plastic deformations of several hundred percent and total extensions of up to 2000% at almost zero applied stress levels creates the need to extend the techniques of creep testing. In this investigation it was desired to keep the test apparatus as simple as possible to permit its use in a variety of test programs, including elevated temperature and combined creep‐fatigue experiments. As a result, a design was developed which permitted the application of very low stresses stimulating quasistatic creep rates over a 20 to 1 strain range, as well as higher stress configurations required to produce significantly elevated creep rates. Test results with a low stress prototype provide creep data for a superplastic lead‐tin alloy over a range of very low strain rates both with and without superimposed fatigue.