The rock expansion pressure tester uses digital display of force values, manually rotates the screw to apply pressure, reads vertical displacement deformation with a dial gauge, and is equipped with testing devices such as permeable plates. The instrument is small in size and easy to operate. Suitable for expansion pressure tests under constant volume conditions in various rock swelling tests.

Automatic data collection system, computer software automatically collects experimental data, saving manpower and increasing the accuracy of experimental data. This automatic data acquisition system mainly consists of a multi-channel acquisition instrument, computer data acquisition software, displacement and force sensors, etc.