The XLT17 provides excellent acoustical amplification qualities, selective filtering capabilities, and simple to use controls. New solid state circuitry and touch-pad controls assure durability even in extreme conditions. The versatile and highly sensitive "Multi-Sensor" microphone uses a muffled microphone for listening through asphalt or concrete slab, but can be adapted with included sound rods for probing the ground above a pipeline or making direct contact with the pipe