To improve safety, economy, and efficiency of scaling in underground metal or nonmetal mines, research was conducted to develop a combination prying-hammering tool for machine scaling. In the prototype claw-hammer assembly, a hydraulic impact hammer was used to drive the claw mechanism into the rock. After a bite was established, the loose rock could be removed using a hydraulically actuated prying motion. This tool combines the advantages of both impact and repair type scaling tools and provides versatility for use in most rock types. The prototype was subject to limited testing (1) to verify its operational functions and (2) to assess its potential capability in future underground testing. The prototype was first bench tested to hydraulically test the independent functions. It was then mounted on a backhoe boom for some preliminary field testing. Both claw and hammering functions operated successfully on concrete and quartzite boulders.