Specification for portable electrical apparatus designed to measure combustion flue gas parameters of heating appliances - Part 3: Performance requirements for apparatus used in non-statutory servicing of gas fired heating appliances; German version EN 50379-3:2004
测量加热设备燃烧烟气参数的便携式电气设备规范.第3部分:燃气加热设备非法定维修用设备的性能要求;德文版EN 50379-3:2004