Sound Level Meter SLM121

Welcome Serrax Technologies to our in-depth look at sound level meters, which are crucial equipment for measuring and monitoring noise levels. This page will give you useful information whether you’re worried about workplace safety, environmental noise rules, or are just interested in sound measuring. We’ll look into the features, categories, uses, and crucial considerations when selecting a sound level meter. A sound level meter is designed for acoustic measurements requirement of safety engineers, health, industrial safety offices and sound quality control in various environments, which include factory, office, traffic, family and audio system and many others. Sound level meter determine sound pressure level (SPL) and the equivalent continuous sound level (LEQ) and other acoustic parameters. With a portable sound level meter, industrial hygiene and workplace safety professional can measure sound levels in multiple locations with location ID to ensure environmental conditions fall within recommended exposure limits.

Understanding Sound Level Meters

Electronic instruments called sound level meters are used to measure sound pressure levels, which are frequently expressed in decibels (dB). They are essential in measuring noise pollution, ensuring rules are followed, and defending people’s wellbeing. Sound level meters offer accurate measurements that help with well-informed decision-making by assessing the frequency and intensity of sound. These tools are frequently used in fields like manufacturing, environmental monitoring, entertainment, and construction.

What is a Sound Level Meter?

An instrument called a sound level meter is used to gauge the level of noise in a given space. It measures sound pressure levels in decibels (dB) and aids in determining if they fall below reasonable bounds.

How Does a Sound Level Meter Work?

.A microphone is used to record sound waves, an amplifier boosts the signal, and a display device shows the measured values in a sound level meter. To simulate how the human ear reacts to various sound frequencies, they use a variety of frequency weighting filters, such as A-weighting (dBA).

Applications of Sound Level Meters

Occupational Safety:

To safeguard workers from excessive noise exposure and to avoid hearing loss, sound level meters are essential for monitoring noise levels in industrial sites.

Environmental Noise Assessments:

Sound level meters are useful for measuring and analyzing noise pollution in cities, close to airports, construction sites, and other sources of environmental noise.

Entertainment and Live Events:

Entertainment & Live Events: To maintain optimal sound quality and abide by noise-level restrictions during concerts, festivals, and athletic events, sound engineers and event planners use sound level meters.

Building Acoustics:

Acoustic performance of buildings, such as sound insulation and room acoustics, are assessed and optimized by architects and engineers using sound level meters.



  • Parameters: SPL, LEQ, L max, L min, L10, L50, Location ID
  • Measurement Range: 30 – 130 dB
  • Resolution: 01 dB
  • Range Selection: Auto
  • Frequency weighting: “A” and “C” type
  • Time Weighting: Slow, Fast
  • Graphics LCD display
  • User selectable logging interval (1 – 60 min)
  • Internal data storage for months
  • USB data transfer to excel file
  • 12 hours of battery backup
  • Rechargeable battery

SPL – 

SPL stands for sound pressure level and is also commonly referred to as efficiency and sensitivity. This parameter represents how loud a speaker is.

LEQ – 

In terms of audio and acoustics, LEQ stands for “Equivalent Continuous Sound Level.” It is a measuring metric used to calculate the typical sound pressure level for a given time frame. To evaluate the total loudness or noise exposure in varied contexts, LEQ is frequently utilized.


The measuring range is the range of measured values for a measured, in which defined, agreed, or guaranteed error limits are not exceeded.

Frequency Weighting: “A” and “C” Type

Sound level meters employ a procedure called frequency weighting to modify the microphone’s sensitivity to various sound frequencies.

“A” Type

Weighted sound level measurements, abbreviated as dBA, are frequently used for environmental noise monitoring, occupational safety evaluations, community noise studies, and noise legislation.

“C” Type

Weighted sound level measurements, abbreviated as dBC, are typically employed for evaluating loud and impulsive noises that may be present in industrial settings, such as work sites, manufacturing facilities, or next to large machinery.



Sound level meters are essential for measuring sound levels, guaranteeing workplace safety, evaluating environmental noise, and improving sound quality in a variety of scenarios. Professionals from a variety of industries may make well-informed decisions about noise management and monitoring by having a basic understanding of the concepts and characteristics of sound level meters. We can make everyone’s surroundings safer and more enjoyable by utilizing this technology.

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