This apparatus is used to determine the strength values of a rock specimen, both in the field and in the laboratory. It consists of a load frame for applying loads up to 55kN, a mounted hydraulic ram and a pressure gauge with 0.001kN precision for maximum load indication. An upper conical platen is fixed on the frame and a lower one on the jack piston. A graduated scale is fixed on the frame and indicates the specimen diameter. The pressure gauge indicator can be read in kN, N, t, kg and bar. The digital display continuously monitors applied load and direct reading of the specimen diameter. Unit is portable and accepts core specimens of up to 4" (101.6mm) in diameter.