Advanced Occupational Noise Measurements

Scarlet ST-15D integrates professional class-1 sound level monitoring with a GPS analyzer that meets IEC and ANSI international standards. It is fitted with one-third octave band filters for detailed sound analysis. Precisely measure sound level and detect noise source with one-device.

Class 1 GPS Sound Analyzer

IEC Certificate
The latest international standards
1/3 Octave
Accurate frequency analysis
Real time monitoring software(Windows)
20-142 dB
Wide measurement range
GPS analyzer
Locate noise source

Best Practice of International Standards
Sound Analyzer

ST-15D meets the most up-to-date IEC and ANSI certifications.
These certifications represent the only and the highest globally standardized approach to testing, inspection, and conformity assessment.

1/3 Octave Band

Analyzing a sound source by frequency basis is really time-consuming, this is where one-third of octave bands make the difference.
ST15D applies 1/3 octave band analysis.

The 1/3 octave analysis is carried out using real-time band-pass filtering with decimation technique. This allows complex sound to be split into smaller sections or bands which then produce detailed filter shapes to accurately specify noise source.

Noise Source
with GPS

Measure sound level, detect sound frequency spectrum in real time, and locate the source of sound from one device.

The integrated GPS shows start and end-point of sound location details.

Smart Software
for Sound Data Management

Monitor real-time noise measurement data and export historical data for further analysis on your computer using Scarlet Sound software.

ScarletSound software is Windows PC-compatible. Install software on the computer and connect ST-15D to computer via USB cable.

Additional Features

Audio Recording

Record Sound Data and Save it into “WAVE” format

Instant Data Printout

Directly print data reports with portable high speed printer

Class-1 Calibration

Calibrate device accurately on your own using ST-120 calibrator

Where does Scarlet Class 1 Sound Level Meter Apply

Road Construction
Police Force
Any Fields Care About Noise Dose


Fulfils StandardIEC 61260-1:2014 Class 1
Dimensions260 x 80 x 30 mm
Display240×320 color screen, adjustable brightness, backlight can be closed
Display Resolution0.1 dB
Frequency Range10 Hz ~ 20 kHz ± 1 dB (not including microphone)
Measurement range20dB-142dB (145dB Peak)
Main Parameters of MeasurementLFp, LSp, LIp, Leq1, Lpeak, Leq,T, LFmax, LFmin, LSmax, LSmin, LImax, LImin, SEL,Ts, Tm, Volt, E.
Accuracy±0.7 dB
Weight0.35 kg (include batteries)
ApplicationNoise integrating measurement
1/3 OCTMeasuring Parameters: Lxyp, Lxeq,0.5s, Lxeq,T, , Lxymax, Lxymin, Tm Note: x is A,C,Z,B,D, F0i y is F,S
1/3 octave band filter, G =103/10
Power Supplybattery 4×AA or external power supply
ContentsMeter, microphone, windscreen, calibration certificate, carrying case, English manual
EnvironmentWorking Temperature: -10 ~ 50°C Storing Temperature: -20 ~ 70°C
Relative Humidity: 25 ~ 90 %
GPSLongitude, latitude, wind velocity, distance, direction and time calibration
Statistical Analysis FunctionMeasure Index: Lxyp, Lxeq,0.5s, Lxeq,T, Lxymax, Lxymin, LxyeqT , SEL, Ln as minimum: 1, 5, 10, 50, 90 with 0.1 dB resolution, SD
Note: x is A,C,Z y is F,S,I n is 1~99
24h measures index: Ld, Ln, Ldn.
Audio RecordingRecord sound data and save it into “WAVE” format
Integrating FunctionLxyi, Lxyp, Lxeq,t, Lxeq,T, Lxmax, Lxmin, Lxpeak LAE, LC-A, SEL
Note: x is A,C,Z, y is F,S,I
PrinterThermal or dot-matrix bluetooth printer (optional)

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Class 1 Sound Meter - ST-15D

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