Bedrock SM30 — Class 2 Sound Level Meter for General Noise Surveys
The Bedrock SM30 is an affordable and reliable IEC 61672-1 Class 2 sound level meter for general-purpose noise surveys, basic acoustic measurements, and screening assessments. It provides professional-grade Class 2 accuracy in a straightforward instrument suitable for preliminary noise investigations, non-regulatory noise surveys, educational use, and applications where Class 2 tolerances are acceptable.
The SM30 is particularly suitable for situations where a quick noise level check is needed before deciding whether a more detailed Class 1 measurement is warranted, for basic occupational noise screening to identify areas requiring follow-up with a Class 1 instrument, and for training purposes where users are learning sound level measurement principles before working with more advanced equipment.
Key Capabilities
IEC 61672-1 Class 2 sound level measurement
A and C frequency weightings — the two most commonly used weightings for noise assessment
Fast and Slow time constants for different noise characterization needs
Lmax, Lmin, Leq, LAeq measurement parameters
Suitable for general noise surveys, site screening, and basic occupational noise screening assessments
Simple operation requiring minimal training for basic measurements
Typical Use Cases
Preliminary site surveys — establish noise baseline before commissioning a detailed Class 1 assessment
Occupational noise screening — identify workstations or tasks likely to exceed 80 dBA so Class 1 follow-up measurements can be prioritised
Neighbour and construction site spot-checks — rapid, documented noise checks in response to complaints or permit conditions
Educational and training use — teaching measurement principles, standard operating procedures, and instrument calibration routines
Product and equipment screening — informal noise level assessments during product development before formal ISO 3744 certification testing
Limitations and When to Upgrade
The SM30 is a Class 2 instrument without STIPA, octave analysis, or data logging. For applications requiring any of the following, consider the appropriate Bedrock Elite alternative:
Regulatory or legal noise measurements — requires Class 1 accuracy: see SM90 or i9
STIPA measurement for voice alarm or PA systems — see SM50 (Class 2 STIPA) or i5 (Class 2 STIPA) or i9 (Class 1 STIPA)