The data logger with USB interface PCE-428-EKIT, from the field of environmental measurement technology, is an optimal sound level meter for measurements at workplaces, construction sites, in traffic, airports, etc. The data logger with USB interface is a class 2 device and is equipped with an octave band frequency filter. Optionally, the data logger with USB interface PCE-428-EKIT 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 a SPL meter over a long period of time, even in the rain.