Whether you need a decibel meter for OSHA workplace compliance, classroom noise management, or professional environmental assessments, choosing the right tool matters. We've reviewed and compared 7 sound level meters across every price point and use case to help you find the best fit.
Before investing in hardware, try our free online decibel meter to get a sense of your noise levels. It's a great way to determine if you actually need a dedicated device.
Quick Comparison
| Meter | Best For | Accuracy | Price |
|---|---|---|---|
| NIOSH SLM App + External Mic | Quick checks & preliminary assessments | ±2 dB (with calibrated mic) | $0 - $30 (mic only) |
| REED Instruments R8050 | Home use, classrooms, basic monitoring | ±1.4 dB | $50 - $70 |
| Extech 407730 | Classroom monitoring, offices, libraries | ±1.5 dB | $60 - $85 |
| BSWA 309 | Professional noise surveys, environmental studies | ±0.7 dB (Type 1) | $800 - $1,200 |
| 3M Edge eg5 | OSHA compliance, personal noise exposure monitoring | Type 2 (±1.4 dB) | $1,200 - $1,800 |
| Cirrus Optimus+ CR:171C | Environmental noise assessment, industrial hygiene | Type 1 (±0.7 dB) | $2,500 - $3,500 |
| DecibelPro Online Meter | Quick checks, education, awareness, preliminary surveys | ±2-3 dB (microphone dependent) | Free |
NIOSH SLM App + External Mic
Best Free OptionPros
- +Free app developed by NIOSH
- +Good for initial noise surveys
- +Pairs with external microphone for better accuracy
- +Available on iOS
Cons
- -iOS only
- -Not accepted for OSHA compliance documentation
- -Accuracy depends heavily on microphone quality
Our verdict: The NIOSH SLM app is a solid free starting point. Pair it with a calibrated external microphone for readings within ±2 dB. Use it alongside our online DecibelPro meter for cross-referencing measurements.
REED Instruments R8050
Best BudgetPros
- +Type 2 accuracy at an entry-level price
- +A and C weighting
- +Fast and slow response times
- +Max hold function
- +Compact and lightweight
Cons
- -No data logging
- -No USB connectivity
- -Basic feature set
Our verdict: The R8050 is the best value for anyone who needs a physical meter but doesn't require data logging. Perfect for teachers, landlords, and homeowners who want reliable readings.
Extech 407730
Best for ClassroomsPros
- +40-130 dB range covers most indoor environments
- +Large, easy-to-read display
- +A and C weighting
- +Max hold and data hold functions
- +Rugged design with tripod mount
Cons
- -No Bluetooth or data logging
- -Analog output only
- -No OSHA-specific features
Our verdict: A solid mid-range option for education settings. The large display makes it easy for students to see readings across the room. Pair it with DecibelPro on a projected screen for real-time classroom monitoring.
BSWA 309
Best Type 1Pros
- +IEC 61672 Type 1 certified
- +Simultaneous multi-parameter measurement
- +USB and Bluetooth data transfer
- +Built-in data logging
- +1/1 and 1/3 octave band analysis
Cons
- -Significant investment for occasional use
- -Requires annual calibration ($150-300)
- -Steeper learning curve
Our verdict: If you need readings that will hold up in court or during an OSHA inspection, this is your entry point for Type 1 accuracy. Worth the investment for safety professionals.
3M Edge eg5
Best DosimeterPros
- +Personal noise dosimeter worn on the shoulder
- +Measures TWA, dose, peak, and Lavg automatically
- +Meets OSHA 29 CFR 1910.95 requirements
- +DMS software for reporting
- +Cable-free design
- +Up to 40 hours of continuous logging
Cons
- -Expensive for single-user applications
- -Requires DMS software for full reporting
- -Annual calibration required
Our verdict: The gold standard for personal noise dosimetry. If you have employees in high-noise environments and need to document TWA exposure for OSHA compliance, this is what you need. Use DecibelPro for preliminary area surveys before investing in dosimetry.
Cirrus Optimus+ CR:171C
Best ProfessionalPros
- +IEC 61672-1 Type 1 certified
- +Simultaneous A, C, and Z weighting
- +1/1 and 1/3 octave band analysis
- +Audio recording with time-stamped events
- +NoiseTools software included
- +Robust environmental housing available
Cons
- -Premium price point
- -Requires training to use effectively
- -Annual calibration ($200-400)
Our verdict: Top-tier instrument for environmental consultants and industrial hygienists. The simultaneous multi-weighting and octave band analysis make it indispensable for thorough noise assessments.
DecibelPro Online Meter
Best Web-BasedPros
- +Completely free, no download needed
- +Works on any device with a browser
- +Real-time dBA readings with A-weighting
- +OSHA TWA and dose tracking
- +Waveform and frequency visualization
- +CSV report export
Cons
- -Accuracy depends on device microphone
- -Not suitable for legal compliance documentation
- -Requires microphone permission
Our verdict: The best option for quick noise checks, education, and awareness. Use it to identify potential noise issues before investing in dedicated hardware. Perfect companion to any physical meter for ongoing monitoring.
How to Choose the Right Sound Level Meter
For OSHA Compliance
You need at minimum a Type 2 meter for area noise surveys and a personal noise dosimeter (like the 3M Edge) for individual exposure monitoring. OSHA requires instruments that meet ANSI S1.4 standards. Learn more in our OSHA noise limits guide.
For Classrooms
A basic Type 2 meter or even our free online meter projected on a screen works well. Students respond to real-time visual feedback about noise levels. See our classroom monitoring guide.
For Home Use
Start with our free online meter. If you need to document noise complaints or check appliance noise, a budget meter like the REED R8050 gives you reliable readings without overspending.
For Professional Assessments
Environmental consultants and industrial hygienists should invest in a Type 1 instrument. The extra accuracy and features (octave band analysis, data logging) are essential for professional reports. Check our decibel chart for reference levels.
Start With a Free Noise Assessment
Before buying any hardware, use DecibelPro to measure your environment for free. You'll get real-time dBA readings, OSHA compliance tracking, and exportable reports — all in your browser.