WCH4 is an innovative modular wireless instrument for cross-hole tests on foundation poles. System core are motorized reels electronically controlled on which are mounted hig-power borehole probes for cross-hole investigations on foundation poles, diaphrams, and all those infrastructural cement or concrete works that could be verified by cross-hole tests, that is through discent in tubes prepared at casting and subsequently filled by water. Each reel of WCH4 system integrates a motorized probe with cable 60 mt, and all control electronics which supervises automatic management of the probes during descent/ascent of probes (cross-hole) and saving data. Due to Rugged tablet and the almost complete absence of physical cabling, settings, measurement management, besides display and interpretation of acquired data, are easy and immediate. In direct analysis mode each wave emitted by the internal generator is fully displayed and moreover it’s possible to modify parameters of display to make even easier reading velocity through crossing and the possible presence of tested defective material. Through the use of 2-3-4 motorized reel with automatic and simultaneous movement, it’s possible to exponentially reduce survey time, because with one only descent/ascent of probes inside investigated pole (which has to be instrumented with 2-3-4 tubes) it’s possibe to obtain corresponding sections. Acquired data at every single pulse are displayed in real time on large monitor of the tablet, allowing immediate viewing of possible imperfection in the investigated structure.