Testo 316-4 Kit 1 - Leak Detector CFC, HFC, HCFC, and H2Everything you need for professional leakage detection: the testo 316 4 set 2 with leak detector for all common refrigerants NH3, CFC, HFC, HCFC, and H2, including refrigerant sensor head, case, mains unit, and earphones. You will therefore be ideally equipped to carry out quick, reliable leakage detection. Specifications A highly accurate sensor of 3g a enables the detection of the smallest leaks Visual and acoustic alarm for optimum leakage