Use the general-purpose sound level meter NL-42 or high-precision sound level meter NL-52 for monitoring environmental noise.
The microphone can be protected with the all-weather windscreen WS-15, and the meters are waterproof, so sudden rain during outdoor use is not a problem.
Continuous measurement for one month is possible. (AC adapter and SD card required. Lp store cycle 100 ms, Leq calculation cycle 10 minutes.)
Recorded data can be processed with the AS-60 data management software for environmental measurement. This software enables measurement data graph display, arithmetic processing, sound exclusion, report creation, file output, and real-sound file playback.