Scarlet ST-12D Professional Class 1 Sound Level Meter

​Key Technical Specifications:

Standards Compliance:
IEC 61672-1 Class 1, ANSI S1.4 Type 1 – for precision-grade sound level measurements in professional and legal applications.

Measurement Range:

• Level Range: 20 dB to 140 dB

• Frequency Range: 10 Hz to 20 kHz – ideal for both low and high-frequency sound analysis.

Frequency Weighting:
A, C, and Z weighting filters – tailored for environmental noise, occupational safety, and customized sound analysis.

Display:

• High-resolution backlit LCD display

• Real-time dB level display with bar graph

• Time history and statistical view (Lmin, Lmax, Leq, etc.)

Microphone:
½-inch pre-polarized condenser microphone with high sensitivity and low noise floor.

Data Logging:

• Internal memory for data storage

• USB interface for data transfer and analysis

• Logging interval: Adjustable (1s to 1hr)

Calibration:
Built-in calibration function
Compatible with standard acoustic calibrators (94 dB/114 dB)

Power Supply:

• 4 x AA alkaline batteries 

• External power supply (USB type-C adapter): 5V, 1A
  

Operating Environment:

• Working temperature: -20 ~ 60 ℃
  

• Relative humidity: 20% ~ 90%
  

Dimensions & Weight:

• Compact ergonomic design

• Approx. 250 × 76 × 33mm

• Weight: ~340g(including battery)

Mounting Options:
Standard tripod mount compatible for stationary environmental monitoring.

Software Compatibility:
Supplied with PC software for data review, report generation, and graph plotting.