NIS – Nordic Industrial Services GmbH – is one of the leading providers of sustainable roof management (RM). With its partners, NIS is represented in more than 11 European countries with a comprehensive range of services. Since 2013, NIS has been working according to the international Sensor Leak Detection Standard (SLD). NIS specializes in safety-relevant areas in roof management. The wide range of services includes, among other things, leak testing, leak detection, cataloging and inventorying of roof areas via drone flights, testing the suitability of photovoltaic systems as well as testing and supporting anchoring devices.