Scarlet ST-25D integrates professional class-2 sound level monitoring that complies with IEC and ANSI standards.
It is equipped with the integration function for detailed sound analysis. Measure sound level and identify noise source with one device.


Model ST-25D sound analyzer meter
Fulfils Standard IEC 61672 Class 2
Dimensions 260 x 80 x 30 mm
Display 240×320 color screen, adjustable brightness, backlight can be closed
Display Resolution 0.1 dB
Frequency Range 20 Hz ~ 12.5kHz ± 1 dB (not including microphone)
Measurement Level Z(FLAT): 38 ~ 130dB
C peak: 145dB
Z(FLAT): peak: 145dB
Measurement range 28dB-133dB (141dB Peak)
Main Parameters of Measurement LFp, LSp, LIp, Leq1, Lpeak, Leq,T, LFmax, LFmin, LSmax, LSmin, LImax, LImin, SEL,Ts, Tm, Volt, E.
Accuracy ±0.7 dB
Weight 0.35 kg (include batteries)
Application Noise integrating measurement
Power Supply battery 4×AA or external power supply
Environment Working Temperature: -10 ~ 50°C Storing Temperature: -20 ~ 70°C
Statistical Analysis Function Measure 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 Recording Record sound data and save it into “WAVE” format
SD card Included
Integrating Function Lxyi, Lxyp, Lxeq,t, Lxeq,T, Lxmax, Lxmin, Lxpeak LAE, LC-A, SEL
Note: x is A,C,Z, y is F,S,I
GPS Longitude, latitude, wind velocity, distance, direction and time calibration (Optional Upgrade)
1/1 OCT Optional Upgrade
Dosimeter Function LAsp,LASMAX,LASMIN,TWA,LEX 8h, LCpeak, LZpeak, LAeq,T, LAVG, DOSE
(Optional Upgrade)
FFT Analysis Sampling Freq: 48 kHz, 24 kHz, 12 kHz, 6 kHz, 3 kHz
Measuring Parameters: MAX, MIN, LeqT
(Optional Upgrade)
Printer Thermal or dot-matrix bluetooth printer (optional)


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