A configurable and modular probe device for electrical connections. The probe device has multiple blocks capable of inter-fitting into various layouts. Each block has four sidewalls. Two adjacent sidewalls have a protrusion and the respective opposite sidewalls have a cavity corresponding to the protrusion. The protrusion of one block can removably mate with the cavity of a neighboring block. Each block further has a central cavity extending from a top surface to a bottom surface of the block. A probe snugly fits into the central cavity.