For measurements in the range below 20 Hz, use the high-precision sound level meter NL-62 supporting measurement from 1 Hz.
The model has a help function that facilitates use in the field also without consulting the instruction manual.
The meter is waterproof (IP54 rating, excluding microphone), so sudden rain during outdoor use is not a problem.
An auto store function is standard, allowing continuous recording of measured instantaneous sound levels, time averaged sound levels etc.
Recorded data can be managed with the AS-60 data management software for environmental measurement.

Supported Technical Standard / Law / Regulation
●IEC 61672-1:2002「Electroacoustics - Sound level meters - Part 1: Specifications」Class 1
●ANSI S1.4-1983「American National Standard Specification for Sound Level Meters」 Type 1
●ANSI S1.4A-1985「American National Standard Specification for Sound Level Meters」 Type 1
●ANSI S1.43-1997「Specifications for Integrating-Averaging Sound Level Meters」 Type 1
●ISO 7196:1995「Acoustics -- Frequency-weighting characteristic for infrasound measurements」


NL-62 Sound Level Meter, Class 1 (with low-freq. sound)
WS-15 All-weather windscreen
WS15006 Windscreen mounting adapter
EC-04 Series Microphone extension cables
AS-60 Data management software for environmental measurement