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Sound Meter

There are no copies available and 2 requests on 1 copy

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Call number: Science Tools


  • 1 Sper Scientific Digital Type 2 Sound Meter
  • 1 calibration screwdriver
  • 1 windscreen


Perfect for testing for OSHA requirements. Meets IEC 61672 class 2 and ANSI S1.4 type 2 frequency and time weighting specifications. Offers a wide variety of measuring options including "A" and "C" decibel frequency weighting scales, fast or slow response, AC or DC output and peak function. The large display has a resolution of 0.1dB and also indicates low battery, and over or under load. Covers 30-130dB in the "A" scale and 35-130dB in the "C" scale, with an accuracy of ±1.5dB. Can be easily calibrated using the internal oscillation system. CE Approved. Has a fold out tripod stand and comes with carrying case


  • Model: 840029
  • Display: ¾in LCD, 3½ digits
  • Range: A weighting - 30 to 130dB, C weighting - 35 to 130dB
  • Resolution: 0.1dB
  • Accuracy: ±1.5dB
  • Frequency: 31.5 to 8,000Hz
  • Microphone Size: 1/2in condenser microphone
  • Output Terminal: 3.5 Ø phone output terminal
  • Frequency Ratings: A and C
  • Response: Fast-readout is maximum value at 0.2 seconds, Slow-readout is maximum value at 1.5 seconds
  • Calibration: Internal oscillation system, 1KHz square wave generator
  • Output Signal: AC - 0.5 Vrms per range step, DC - 0.3 to 1.3VDC, 10 mV per dB, Output impedance is 600ohm
  • Operating Temperature: 32 to 122F
  • Operating Humidity: Max 90% RH
  • Power Consumption: Approx. DC 6mA


View Instructions (PDF)

Community Reviews


I can't wait to use it sometime!


This works really well! I used it for my science fair project and we won 2nd place!

It's wonderful that the library has this for loan

Great for home schooling projects or just fun to explore the quietest and loudest items in the house.

Fun for Kids and Adults

As it turns out, the quietest place in our house was in a closet (50 dB) and the loudest was at the ice maker (101 dB!).
Street noise and a toilet flush are both 78 db.


amazingly funny.


It's fun to experiment with

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