Amprobe SM-20A Sound Meter

(4 customer reviews)

  • Designed to meet the measurement requirements of safety engineers, health, industrial safety offices and quality control in various environments.
  • A and C weightings for checking compliance with safety regulations as well as acoustic analysis
  • Measuring ranges: A weighting 30 – 130 dB, C weighting 35 – 130 dB
  • Frequency range: 31.5 Hz – 8 kHz
  • Display with 0.1 dB steps on a 4 digit LCD
  • Slow (1 sec) and fast (125 ms) response settings to check peak and average noise levels
  • Max/min recording
  • Internal memory, 14,000 records
  • Recording intervals from 1 second to 8 hours
  • PC computer download capabilities
  • Data hold to freeze reading on digital display
  • CE, designed to meet IEC651 type 2, ANSI S1.4 type 2
SKU: 3477333 Category:


The Amprobe SM-20A Sound Meter has been designed to check compliance with safety regulations and perform acoustic analysis by safety engineers, health, industrial and safety offices as well as quality control. The SM-20A offers a PC interface.

They use two different weighting filters required by the IEC651 and ANSI S1.4 Type 2 for audio filtering. The A weighting is for general noise sound level and the C weighting is for measuring sound level of acoustic material control in various environments (ie 94 dB 1  kHz, etc).


Features SM-10 SM-20A
Microphone 1/2 Electret condenser microphone
Standard applied IEC 651 Type 2, ANSI 1.4 Type 2
Dynamic range 50 dB
Time weighting Fast (125 mS), Slow (1 sec)
Frequency range 31.5 Hz → 8 kHz
Measuring level range (Auto Range) A-Weighting: 30 dB → 130 dB
C-Weighting: 35 dB → 130 dB
Data Data hold Min/max
Internal memory 14,000 records
Display: 4 digits LCD
Microphone: 1/2 inch Electret condenser microphone
Power supply: 9V NEDA 1604, IEC 6F22, JIS 006P battery
Auto power off: Approx. 5 min
Environment: Indoor operation, < 2000 m
Standard applied: IEC 651 Type 2, ANSI 1.4 Type 2
Dynamic range: 50 dB
Resolution: 0.1 dB, display update: 0.5 sec.
Time weighting: FAST(125mS), SLOW(1 sec)
Accessories: Carrying case, windscreen, User manual and 9V battery



Sound Meters

Test sound levels with two types of weighting with Amprobe sound meters.

What’s Included

  • SM-20A
  • Carrying case
  • Battery (installed)
  • USB cable download and software CD


Datasheet »
Product Manual »

4 reviews for Amprobe SM-20A Sound Meter

  1. dnmroberson

    Works Awesome

    I work in a manufacturing plant and we regularly check the sound levels to make sure we are using the right hearing protection. We have been using the Amprobe SM-20-A Sound Meter for a while now and its ease of use and simple operations make for quick and easy testing. Love it and recommend it to everyone.

    ✔ Yes, I recommend this product.

  2. starbrander

    This Product Confirmed The Level Of Noise Contributing To My Hearing Loss

    I was amazed,It not only proved to be invaluble in my work, but to prove that the levels I was trying to prove were causing my hearing loss were confirmed by the SM-20. Lightweight And accurate to + or – 1.5dB. A great audio measuring tool at a great price

    ✔ Yes, I recommend this product.

  3. AlexC

    Great Product Great Price

    I needed a sound meter for doing PA system work to justify the additional speakers in certain areas that have a higher ambient noise. This Sound Meter gave me real numbers to present real data to my customers. The sound meter is simple, durable, and easy to use. It now a part of my regular use collection of tools.

    ✔ Yes, I recommend this product.

  4. Wirenutz

    Quality tester for industrial applications

    We use this unit for level matching equipment in high noise areas. We are able to present hard data to our customers proving our efforts and documenting results.
    Amprobe equipment is top notch and always have great results with it. The DMM’s are great as well.

    ✔ Yes, I recommend this product.

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