ST-11D Class 1 Sound Level Meter

No formal training is needed. We provide complete instruction on how to use the device, please check the user guide.

An accurate noise measurement instrument that meets IEC 61672-1:2002 standards (or equivalent standards such as BS EN 61672-1:2003). It has tighter tolerances (+/- 1.9 dB at 1 kHz) compared to Class 2 (+/- 2.2 dB). Class 1 meters are ideal for measuring sound pressure, Leq, and peak sound pressure, often required by regulations like the UK’s Noise at Work.

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.

Using a windscreen or weatherproof outdoor kit helps reduce wind noise and ensures accurate readings in outdoor settings.

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.

Yes. ST-11D supports analog outputs and RS-232 serial communication, enabling integration with external systems such as weather stations or environmental monitoring system.