Sound level meter

NL-28

Compact class 2 sound level meter

The Rion NL-28 is a Class 2 sound level meter designed for reliable, everyday use in occupational and environmental noise assessments.

Its compact, lightweight housing and ergonomic layout allow comfortable one-hand operation in the field. The high-contrast OLED display provides clear, stable readings even in low-light conditions, making the NL-28 well suited for workplace noise evaluations, environmental surveys, and boundary noise control at industrial sites.

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NL-28 Sound Level Meter from Rion

Explore the possibilities with NL-28

This video demonstrates the different use of this compact class 2 sound level meters from Rion.

Design and handling

The NL-28 combines a user-oriented design with an intuitive interface that supports efficient operation in daily noise assessments. The high-contrast OLED display ensures clear, reliable readings in a range of lighting conditions, while the ergonomic housing enables comfortable, secure handling during extended measurement tasks. Its compact, lightweight design enhances portability for on-site inspections and mobile use.

Data storage and connectivity

Internal memory provides secure storage for measurement data, and the integrated USB interface supports straightforward data transfer and further analysis on a PC, enabling streamlined documentation and reporting workflows. The built-in USB interface also simplifies integration with reporting or analysis software.

Measurement performance

The NL-28 measures A‑weighted sound pressure levels, time‑averaged noise levels, and maximum noise levels, making it suitable for typical occupational and environmental noise surveys. All collected data can be stored in the instrument’s internal memory for later review and compliance verification.

Power and calibration

Powered by two AA alkaline batteries, the NL-28 offers continuous operation for up to 9 hours, supporting a full working day of field measurements without frequent battery changes. The instrument also includes an automatic acoustic calibration function to maintain measurement accuracy and simplify routine verification, supporting reliable, standards-compliant noise assessments over its lifetime.