Sound Level Meters

A sound level meter—also known as decibel metre, noise meter or SPL meter— is a handheld electronic device used to measure sound pressure levels in an environment. It provides precise readings in decibels (dB), quantifying the intensity of ambient noise.

What is a Sound Level Meter?

A sound level meter works by detecting variations in air pressure caused by sound waves and converting them into electrical signals. These signals are then processed and displayed as decibel values on a digital screen. Most meters feature an integrated digital display and some have an inbuilt datalogging memory to store readings. Many models can be attached to a smartphone or tablet and the data easily shared. Some models need connecting to a computer to export data.

Sound level meters are commonly used for:

• Workplace safety: Monitoring industrial noise to comply with occupational health regulations
• Environmental noise monitoring: Measuring community, traffic, and construction noise
• Laboratory testing: Ensuring controlled acoustic environments and equipment calibration

With accurate readings and versatile connectivity options, sound level meters are essential tools for professionals in health and safety, environmental science, engineering, and audio testing.

Why Use a Sound Level Meter?

Sound level meters will give you measurements on the level of noise within an environment. High noise levels can damage hearing, cause hearing loss and can have a detrimental effect on health. With a reading from a sound meter, you can make sure that you have the correct measures in place (such as slowing down machinery to minimise excess noise) and appropriate PPE (Personal Protective Equipment) to minimise risk.

Sound Level Meters can help support a healthy building environment by managing noise pollution, contributing to improved occupant comfort and well-being.

How Sound Level Meter Works

A sound level meter operates by capturing and converting acoustic energy into readable decibel data through the following steps:

Microphone Detection: A sensitive microphone detects sound pressure levels in the environment and converts them into an electrical signal.

• Signal Processing: The signal is processed internally and often passed through a frequency weighting filter—typically A, C, or Z weighting—to simulate how the human ear perceives different frequencies or to meet specific measurement standards.
• Decibel Conversion: The processed signal is then converted into a decibel (dB) reading using a logarithmic scale.
• Display and Connectivity: Readings are shown on an integrated digital display. Many models support data logging, and some offer smartphone or computer connectivity via USB, Bluetooth, or Wi-Fi for real-time analysis.
• Response Time Settings: Users can select between Fast, Slow, or Impulse modes, depending on whether they need to measure fluctuating, steady, or sudden noise levels.

These adjustable settings make sound level meters versatile tools for professional noise monitoring in a wide range of applications.

Difference between Sound Meter Class 1 and Class 2

There are two classes of sound meter—Class 1 and Class 2 (also referred to as Type 1 or Type 2), —as defined by the IEC 61672 standard. The key difference lies in their accuracy and intended applications.

Sound Meter Class 1

Class 1 sound meters are high-precision instruments designed for laboratory testing, environmental noise assessments, and regulatory compliance. These meters feature a wider frequency range and stricter tolerances, making them suitable for professional applications where accuracy is essential.

Sound Meter Class 2

Class 2 sound meters are intended for general-use environments such as occupational noise monitoring, workplace safety, and basic environmental checks. While still IEC 61672 compliant, they have a narrower frequency range and are more cost-effective for everyday noise measurement tasks.

What is weighting?

Weighting refers to how a sound level meter adjusts its sensitivity to different frequencies, mimicking the way the human ear perceives sound. Most meters offer several frequency weighting settings:

• A-Weighting (dBA): The most common setting, covering a 20 Hz to 20 kHz range. However, the sound is cut from the lower and higher ends of the spectrum in order to approximate the frequency that is audible to the human ear.
• C-Weighting (dBC): Can measure much higher noise levels, but still covers the frequency heard by the human ear.
• Z-Weighting (dBZ): Applies no filtering—covers the whole frequency range between 10Hz to 20 kHz, ±1.5dB.

These weighting settings ensure that sound level meters provide relevant and reliable data tailored to specific applications and standards.

Should I calibrate my sound level meter?

Calibration is essential to ensure your sound level meter delivers accurate and reliable readings. Over time, environmental factors and regular use can affect sensor performance, making calibration a key part of ongoing maintenance.

• Why calibrate? Regular calibration verifies that the meter measures sound pressure levels accurately, in line with industry standards.
• How often? It’s recommended to calibrate every 1–2 years, or as required by ISO/IEC 17025 and other relevant standards.
• RS Calibration Services: RS offers professional calibration services for sound level meters and other measurement tools. Learn more about RS calibration services.

What is a Dosimeter?

Sound level meters measure the noise within a whole environment whereas dosimeters measure personal exposure to noise. Dosimeters (or dosemeters) are typically attached to an individual at work to monitor noise levels.

Industrial Applications of Decibel Meter

Sound level meters and decibel meters are widely used across multiple industries to monitor noise levels, ensure compliance, and protect hearing and equipment. Below are key industries where these meters are commonly used:

• Automotive Industry: Decibel meters help measure engine noise, cabin acoustics, and soundproofing performance. Accurate data ensures vehicles meet regulatory standards and provide an optimal user experience.
• Construction & Building: Used for monitoring environmental noise, machinery output, and workplace safety compliance. This helps construction firms stay aligned with occupational health and local council regulations.
• Manufacturing & Industrial Plants: Noise meters are crucial for monitoring high-noise zones, maintaining safe sound exposure limits, and assessing equipment health through acoustic patterns.
• Environmental & Community Monitoring: Authorities and consultants use sound meters for measuring ambient noise levels in urban planning, airport noise studies, and public complaints about excessive noise.
• Laboratories & Research: Precision-grade Class 1 sound level meters are used for controlled testing environments, acoustic research, and product development across acoustics, electronics, and engineering disciplines.

How to Choose the Right Sound Decibel Meter

When selecting a sound decibel meter, consider these key features to ensure it matches your application:

• Class rating (Class 1 for precision, Class 2 for general use)
• Frequency weighting options (A, C, Z)
• Response time settings (Fast, Slow, Impulse)
• Data logging and memory capacity
• Display type (analogue vs digital)
• Connectivity (USB, Bluetooth, or Wi-Fi sync to smartphones or PCs)
• Power options (battery life, rechargeable options)
• Microphone sensitivity
• Compliance with IEC 61672 standard
• Environmental durability (IP ratings, operating temperature range)

Noise Meter Manufacturer, Supplier & Distributor in Australia

RS Australia is a reputable manufacturer, supplier, and distributor of premium noise meters and sound level meters. Our selection ranges from basic decibel meters to sophisticated Class 1 devices, all competitively priced to deliver great value while meeting stringent international standards. Browse from globally trusted brands like Castle, Martindale and Casella Cel .Whether for workplace noise monitoring or environmental noise assessments, RS provides dependable solutions nationwide.

Buy Sound Meter Online from RS

Purchasing your sound meter through RS Australia’s online store is simple and efficient. Browse our comprehensive catalogue to find the right sound meter and other tools such as circular connectors and sound cables. Finalise your order using our secure payment methods, including credit cards and business accounts.

With a well-established logistics network, we offer fast, nationwide doorstep delivery—usually within 1 to 3 business days. For more information on how to order, delivery times, shipping fees, and available options, please visit our Delivery Information page. Get precise noise measurement instruments delivered directly to your location — buy your sound meter from RS Australia today!