This model rock direct shear test machine is used for rock shear test under constant vertical pressure, it features compact structure, easy in operation. It’s comprised of two parts, the jack on upper half supply normal stress,  lower half has two jacks, one for shearing on one side and the  other for measuring the residual stress. Horizontal movement of the box is recorded on dial gauge. The main body is made of aluminium material, transparent acrylic sheet side-plates enable proper aligning of samples, an adjusting clamp is provided to hold the specimens.