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Rion · Compact sound level meters · Handheld sound level meter

Rion NL-28

Current

Pocket-sized Class 2 sound level meter with an OLED display, USB-C data export to CSV and automatic acoustic calibration before and after measurement. Measures A- and C-weighted Lp, Leq, LE, Lmax and C-weighted peak with 1 min to 1 h measurement intervals from two AA cells. Successor to the NL-27.

Specifications verified on .

Type
Handheld sound level meter
Class
Class 2
Channels
1
Octave bands
None
Connectivity
USB-C
Weight
160 g
Battery life
9 h
Compare with other instrumentsAll handheld sound level meters

Specifications

As published by Rion. Fields the manufacturer does not publish are omitted rather than estimated.

Standards and class — Rion NL-28
SpecificationValue
IEC 61672-1 classClass 2
StandardsIEC 61672-1:2013 class 2, JIS C 1509-1:2017 class 2, JIS C 1516:2020 class 2
Measurement — Rion NL-28
SpecificationValue
Channels1
Measurement rangeA 30 to 137 dB; C 36 to 137 dB
Peak range65 to 140 dB (C-weighted peak)
Frequency range20 Hz to 8 kHz
Frequency weightingsA, C
Time weightingsF, S
ParametersLp, Leq, LE, Lmax, Lpeak
Analysis — Rion NL-28
SpecificationValue
Octave bandsNone
Reverberation timeNo
Building acousticsNo
Audio recordingNo
Logging and data — Rion NL-28
SpecificationValue
Shortest logging interval1 min
MemoryInternal, 200 data sets; 999 calibration records
Hardware — Rion NL-28
SpecificationValue
MicrophoneUC-52, about -33 dB re 1 V/Pa
Detachable preamplifierNo
Display1.5" monochrome OLED, 128 x 128
Battery2 x AA (alkaline or Ni-MH)
Battery life9 h
Weight160 g
Dimensions (mm)200 x 50 x 34
Operating temperature (°C)-10 to 50
Connectivity and software — Rion NL-28
SpecificationValue
ConnectivityUSB-C
Latest firmware01.02.0011 (22 July 2026)

Where this data comes from

Manufacturer documents used for this record
KindDocumentAccessed
Product pageClass 2 Sound Level Meter NL-28
DatasheetNL-28 Datasheet (print code 2402-1)
Product pageNL-27 discontinued page naming NL-28 as successor

Verified on . Only the manufacturer’s own published material is used; distributor pages are not sources.

Spec out of date? Tell us (reference rion-nl-28).

Verified owner reviews

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Known issues and firmware notes

Hardware and firmware problems reported by owners, with the firmware version concerned and any manufacturer response.

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Feature requests

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