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    Digital Sound Level Meter, 25 to 140 dB

    Class 1 sound level meter is an instrument for measuring noise in the range of 25 decibels to 140 decibels, RS-232 digital output interface, the noise level meter works for detecting industrial noise, such as various machines, vehicles, ships, and appliances.
    SKU: SISCO-SLM-5661-3C
    i h
    🚚 Free shipping
    🔙 30-day returns
    📅 Delivery: 7-12 days

    The noise level meter has a wide measurement range, can detect noise from 25 dB(A) to 140 dB(A), and is easy to operate. It adopts advanced digital detection technology, which greatly improves the stability and reliability of the instrument.

    Sound meter panel display

    Digital Signal Processing Technology

    • The sound decibel meter meets Class 1 standards.
    • Advanced digital detection technology, good stability and wide dynamic range.
    Sound meter details

    Overload indication function

    • Overload indication, over the measurement range automatically prompt, the digital sound level meter is not damaged.
    • Single range, wide dynamic range, no need to switch, simple and convenient operation.


    The digital sound level meter can be widely used in various machines, vehicles, ships, electrical appliances and other industrial noise measurement and environmental noise measurement, suitable for factory enterprises, architectural design, environmental protection, labor and health, transportation, teaching, medical and health, scientific research and other departments of the sound test field.

    Sound level meter applications

    Model SISCO-AWA-5661-3
    Microphone Model AWA14425
    Measuring Range 25 dB(A)~140 dB(A)
    Spontaneous Noise <18 dB(A)
    Frequency Range 10 Hz~20 kHz
    Frequency Weighting Parallel (simultaneous) A, C, Z for each channel
    Time Weighting Parallel (simultaneous) F, S, I, Peak for each channel
    Monitor 128×64 LED dot matrix
    Output Interface AC, DC, RS232, PWM
    Points Function Yes
    Main Measurement Index LFp, LSp, Lip, Leq·T, Lpeak, Leq·T, Lmax, Lmin, SEL, Lex8h, LAVG, TWA, DOSE, L5, L10, L50, L90, L95, SD, E
    Overrun Indication The limit can be set
    Data Storage Function 8000 Groups
    Recording Function Optional
    Statistical Analysis Function Optional
    Power Supply 4 (7#) alkaline batteries, can work continuously for more than 6 hours; lithium battery (optional): After fully charged, it can work continuously for more than 16 hours
    5 V external power supply: DC5 V~DC6.5 V, working current <120 mA
    Dimension 190mm x 68mm x 27mm
    Weight 1.5 kg
    Operating Temperature -10 ℃~50 ℃
    Warranty 12 Months

    Q1: What is a noise detector?
    A1:  Noise tester is an instrument used for noise detection and testing in public places such as work sites and squares. Factory noise monitoring Noise pollution is one of the environmental pollutions that have a greater impact. Higher decibel noise can even cause serious damage to people's eardrums and cause deafness. The application of the noise tester can provide the decibel that the noise reaches in order to take relevant measures to control and reduce the noise. The measurement unit of the sound level is decibels. The professional noise tester has a highly sensitive sensor, high accuracy, and a wide range of applications. It can be widely used for noise measurement in various environments. Sound level measuring instrument, collectively referred to as sound level meter.

    Q2: Sound level meter working principle
    A2: The sound level meter uses a microphone to convert the sound into an electrical signal, and then a preamplifier converts the impedance to match the microphone with the attenuator. The amplifier adds the output signal to the weighting network, performs frequency weighting on the signal (or an external filter), and then amplifies the signal to a certain amplitude through the attenuator and amplifier, and sends it to the effective value detector (or external press Level recorder), give the value of the noise level on the indicator head.

    Q3: How big is the decibel scale?
    A3: Sound is measured in decibels (dB). Whispering is about 30 decibels, normal conversation is about 60 decibels, and motorcycle engines run at about 95 decibels. Noise above 70 decibels for long periods of time may begin to damage your hearing. Loud noises above 120 dB can cause immediate damage to your ears.

    Tips: Why the decibel meter level linearity is over-poor in the calibration process?

    1. Noise meter, the signal generator's self-generated noise is too high to affect the lower limit of level linearity.
    2. The sensitivity level deviates from the original preset value resulting in a deviation from the 
      upper and lower range.
    3. The test environment noise is high leading to the linear lower limit instability.
    4. External power supply 
      electrical noise interference caused by the available battery to exclude.

    Thank you for buying industrial test and measurement equipment on, all products sold by SISCO and the partner cover a 12 months warranty, effective from the date of receiving the products.

    What is covered?

    SISCO is responsible for providing free spare parts, and free technical support to assist the customer to repair the defective products until the problem is solved.

    What is not covered?

    • Product purchased from anyone other than a SISCO store or a SISCO authorized reseller.
    • Expendable parts.
    • Routine cleaning or normal cosmetic and mechanical wear.
    • Damage from misuse, abuse or neglect.
    • Damage from use of parts other than SISCO approved.
    • Damage from use outside the product’s usage or storage parameters.
    • Damage from use of parts not sold by SISCO.
    • Damage from modification or incorporation into other products.
    • Damage from repair or replacement of warranted parts by a service provider other than a SISCO authorized service provider.
    • Damage caused by the application environment not meeting the product usage requirements and the failure to perform preventive maintenance.
    5.0 1
    Write your own review Close
    Janet | 3/22/2023 6:14 PM
    Well built sound level meter
    This sound level meter feels well constructed and solid and has the features I was looking for. It has been two months since I bought this product and so far there have been no problems.