large color LCD screen (3-inch) No paper manual is needed (Help function) Water-resistant (IP54; except for the microphone) Use of rechargeable batteries (or dry alkaline batteries) Supports long-term measurements (up to about 1 month) Option: Octave, 1/3 octave real-time analysis program (NX-62RT), FFT analysis program (NX-42FT) and Data management software (AS-60/AS-60RT).