The Qtac is a high sensitivity low energy ion scattering (LEIS) instrument. It is extremely surface sensitive, providing elemental and structural characterisation of the top atomic layer. This new generation instrument has been developed to include small spot analysis, surface imaging, and both static and dynamic depth profiling. Its unique surface sensitivity makes the Qtac the perfect tool to study surface processes. The Qtac provides valuable  information in many production and research areas on materials such as catalysts, semiconductors, metals, polymers, fuel cells, and biomaterials.