CENTER 384 Track Gas Leak Detector can detector mixture 5% Hydrogen (H2) + 95% Nitrogen (N) with extremely sensitivity. The unit is built in newly developed heated semi-conductor sensor and microprocessor control to provide reliable digital signal processing. Adjustable leak sensitivity leavel and 7 LED visual indicators also offer the users the ease and convenience of operations. It can detect less than 5 ppm Hydrogen concentraton.