Gas leak detector for leak detection in indoor gas installations. The SNOOPER mini is a robust gas leak detector and is suitable for checking accessible gas lines for external leak tightness. Leaks are determined based on detection at connection points, e.g. fittings, flanges, threaded connections and gas regulator fittings The gas concentration is displayed in the ppm range. House lead-ins and concealed gas lines in enclosed spaces at air outlets can also be checked.