Hydrogen leak detector is a unique instrument for industrial leak detection and tightness control. This is sensitive and can be used to find leaks as small as 5 x 10-7 mbar x l/s, comparable to leaks 1000 times smaller than detectable with a traditional soupy water or bubble tests. The inherent characteristics of Hydrogen enable fast, precise and safe leak location and qualification. Hydrogen leak detection is done with a safe 5% hydrogen in 95% nitrogen gas mix. Because hydrogen is quickly transported to the leaks and dissipates much faster than other gases it allows for much quicker testing and re-testing than other gases.