The test sensitivity of classic sniffer test methods  is  limited  by  the  helium  concentration  in  the  air,  but  by  reducing  the  atmospheric helium concentration the test sensitivity can be significantly improved. The Ultra Sniffer Test gas (UST) method is simple – there is no evacuation of the test chamber, only a filling with helium free gas. The method has successfully been used for testing super conducting coils for Wendelstein 7-­‐X at the Max Planck Institute for Plasma Physics (IPP) in Greifswald. The technology is ready for use in the non-­‐fusion domain  and  is  currently  being  commercialized  by  the  inventor,  Mr.  Robert  Brockmann.