Exploration of volumetric data is an essential task in many scientific fields. However, the use of standard devices, such as the 2D mouse, leads to suboptimal interaction mappings. Several VR systems provide better interaction capabilities, but they remain dedicated and expensive solutions. In this work, we propose an interface that combines tangible tools and a handheld device. This configuration allows natural and full 6 DOF interaction in a convenient, fully portable and affordable system. This paper presents our design choices for this interface and associated tangible exploration techniques.