Electronic leakage detector with quickchange gas sensors for reliable detection of different gases and refrigerants. Flexible extension 200 mm, quickchange gas sensor GS4 F for inflammable gases butane (C 4 H10 ), methane (CH4 ), propane (C3 H8 ), hydrogen (H2 ), 2 batteries 1.5 V, AAA, LR3. In a strong soft bag