The class 2 outdoor aircraft noise meter PCE-428-EKIT-ICA, from the field of environmental measurement technology, is an optimal sound level meter for measurements at workplaces, construction sites, in traffic, airports, etc. The outdoor aircraft noise meter is equipped with an octave band frequency filter. Optionally, the outdoor aircraft noise meter can be upgraded with a 1/3 octave band filter. The additional kit for outdoor sound measurement makes it possible to measure outdoor noise with an aircraft noise meter over a long period of time, even in the rain.