ST-21D Class 2 Sound Level Meter
Integrating Algorithms for Occupational Noise
Overview
ST-21D Sound Level Meter meets the Class 2 IEC 61672:2013 standard, making it ideal for general environmental noise measurements. It calculates continuous sound levels and exposure over a set period, ensuring compliance with OSHA and Noise at Work regulations to protect employee hearing and safety.
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Outputs & Indicators
It includes DC/AC, USB, and RS232 outputs for effortless data transfer and integration, with LED indicators providing clear visual feedback.
Display
ST-21D comes with a clear, user-friendly OLED display, providing intuitive navigation and easy access to sound measurements.
Microphone
The 1/2" prepolarized condenser microphone measures sound levels.
Why Choose ST-21D?
Designed for environmental & occupational noise measurements
High Precision
IEC 61672:2013 Class 2 standard with high accuracy of ±0.7 dB
Smart Integration
Measures and displays Leq value with adjustable A/C/Z frequency weightings
Built-in Datalogger
Download raw data directly to your computer using a USB cable
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Measure environmental noise accurately with the ST-21D sound level meter
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Factory
Motor noise inspection
Motor noise inspection
Construction site
Traffic noise assessment
Data Transfer to Windows PC
Transfers data to a Windows PC via USB cable and stores up to 8,000 sets of measurement results, including timestamp, % dose, and TWA.
Quality Assurance & Packaging
Every ST-21D is rigorously tested for quality before shipping and securely packed in a cardboard hand carry case to protect its components. This ensures your sound level meter arrives in perfect condition, ready for use.
Frequently Asked Questions
Find quick answers below, or visit our FAQ page for more.
Is training required to use the ST-21D?
No formal training is needed. We provide complete instruction on how to use the device.
How often should I calibrate the ST-21D?
Conduct field calibrations before and after each use.
How is background wind noise reduced?
Using a windscreen helps reduce wind noise and ensures accurate readings in outdoor settings.
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Specifications
- Datasheet
- Features
- Package List
- FAQ
- Download
| Item | Description |
|---|---|
| Fulfils standard | IEC 61672:2013 Class 2 |
| Main parameters of measurement | LFp, LSp, LIp, Leq,t, Lpeak, Leq,T, LFmax, LFmin, LSmax, LSmin, LImax, LImin, SEL, Lex8h, LAVG, TWA, DOSE, Ln1, Ln2, Ln3, Ln4, Ln5, SD,Ts, Tm, Volt, E |
| Measurement range | 28 to 133 dB |
| Measurement level | Z(FLAT): 38 to 130 dB / C peak: 145 dB / Z(FLAT) peak: 145 dB |
| Frequency range | 20 Hz to 12.5 kHz |
| Display | 128 × 64 OLED |
| Weight | 0.4 kg |
| Application | Sound level meter, noise dosimeter, data logging & precision recording (Optional) |
| Power Supply | 4×AAA batteries or external power supply |
| Dimensions | 310 × 72 × 32 mm |
| Features |
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| ▪ IEC 61672:2013 Class 2 |
| ▪ 28dB to 133dB wide measurement range |
| ▪ Data Logging |
| ▪ RS232 & USB Data Output |
| ▪ Leq value with A/C/Z/B frequency weightings |
| Package List |
|---|
| ▪ ST-21D sound level meter |
| ▪ 1/2" prepolarized condenser microphone |
| ▪ Windscreen |
| ▪ User manual |
| ▪ Calibration certificate |
| ▪ Cardboard hand carry case |
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No formal training is needed. ST-21D features an intuitive interface, making it easy to use for professionals and beginners alike.
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A Class 2 sound level meter meets the accuracy and performance standards defined by IEC 61672 for general-purpose sound measurements.
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Your choice depends on the application:
Class 1: Preferred for environmental noise surveys, low noise levels, legal applications, and standards like ISO 20906:2009 for aircraft sound monitoring.
Class 2: Suitable for less demanding applications without strict accuracy requirements. -
Conduct field calibrations before and after each use. Additionally, have the device professionally calibrated annually to maintain compliance with standards.
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Using a windscreen or weatherproof outdoor kit helps reduce wind noise and ensures accurate readings in outdoor settings.
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Yes, Scarlet offers microphone extension cables (available in 2.5m and 5m lengths) that allow the microphone to be positioned away from the meter, ideal for specific monitoring setups.
Where does Scarlet Sound Level Meter Meter Apply
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