Scarlet Tech Ltd.

- Model ST-11/11D - Class 1 Integrated Sound Level Meter



Class 1 Complies with IEC-61672-2013. 10 Hz-20k Hz frequency range. 27 dB-140 dB measurement range. Data logging & record function (St-11D). Measures and displays Leq value. Long term measurement.

High Precision
IEC 61672-1:2013 Class 1 Standard ±0.7 dB High Accuracy

Smart Integration
Measures and Displays Leq Value
Adjustable A/C/Z Frequency Weightings

Wide Measurement
27-140 dB Measurement Range
Competent for Rigorous Industrial Use


ST-11 and ST-11D Sound Level Meters fully comply with the latest Class 1 IEC 61672:2013 standard. Built-in smart integrating algorithms and wide measuring range 27-140dB competent in most rigorous industrial use.

Measures and displays Leq value. Shows Equivalent Continuous Sound Level and Sound Exposure upon the chosen time period, ideal for occupational noise measurements such as the Controls of Noise at Work Regulations or the OSHA Occupational Noise standards. Safeguard and ensure employees’ hearing and occupational safety at the front line.


The advanced ST-11D is your ideal sound level meter for real-time noise measuring as well as long-term noise exposure documenting over time. Condenser microphone for high accuracy & long-term stability. Built-in memory for sound recording and measurement results (including Start/Stop Time, %Dose, TWA). Low power combustion and USB port charging allow long hour usage.

  • IEC 61672-1:2013 Class 1 Standard
  • 27-140 dB measurement range
  • ±0.7 dB high accuracy
  • 0.1 dB resolution
  • 10-20k Hz frequency range
  • A, C, Z frequency weightings
  • Fast, Slow, Impulse, Peak time weightings
  • RS232 Data Output / USB computer interface
  • Data Logging & Record functions (ST-11D)
  • Optional Class 1 Sound Level Calibrator (94/114 dB)

  • Construction
  • Orchestras
  • Road Construction
  • Airport
  • Police Force
  • Any Fields Care About Noise Dose

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