CHUM crosshole logging test instrument has two transceivers; each one can transmit and receive, which makes testing faster and easy on-site. It has basic 50m cables and the option for 100m or 150m. long cables. The CHUM software runs on your MS Windows laptop. CHUM supports 2D tomography and 3D tomography. To view the 3D Tomography images, you can purchase the 3DT software. More about the CHUM and the crosshole test method here