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.
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:
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.
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.
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.
These adjustable settings make sound level meters versatile tools for professional noise monitoring in a wide range of applications.
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.
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.
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.
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:
These weighting settings ensure that sound level meters provide relevant and reliable data tailored to specific applications and standards.
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.
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.
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:
When selecting a sound decibel meter, consider these key features to ensure it matches your application:
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.
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!