Products > Sound Level Meters > CEL242

CEL242 Sound Level Meter with Data Logging

CEL242 Logging Sound Level Meter
CEL242 Logging Sound Level Meter

Price List

Logging Type 2 Sound Level Meter
Lead time 2 weeks

Logging Sound Level Meter with Calibrator and Case
Lead time 2 weeks

Type 2 Sound Level Calibrator
In stock

NoiseMeters Applications web based noise reports
In stock

The delivery price is calculated during checkout based on your location and the goods ordered. Our basic delivery prices are:

Delivery within USA: $40.00

Delivery Service: Five working days*

* For products that are in stock and the order received by midday.

Some products go through a final configuration and calibration before being shipped. If the calibration labs are busy this can add up to two days on to the delivery schedule but guarantees a fresh calibration.

Logging Type 2 Sound Level Meter
2 weeks

Logging Sound Level Meter with Calibrator and Case
2 weeks


  • Data logging with download to computer
  • Quick and easy to use
  • Lightweight but rugged case
  • 2 year warranty
  • Calibration certificate included


  • General noise measurements
  • OSHA occupational noise surveys
  • Fire alarm testing


  • ANSI S1.4 and IEC 60651 to Type 2
  • IEC 61672 Class 2

Digital Technology and Graphical Display

Unlike most sound level meters in this price range, the CEL242 uses the latest in digital technology - models using the older analog techniques tend to drift more over time and with temperature and air pressure changes. Sampling and digitizing the signal closer to the microphone ensures a much more stable sound level meter for repeatable measurements.

The graphical display gives the option of viewing the sound level as a simple number (shown to the left) or as a graph, clearly showing the variation of noise over time (see main image).

Data Logging and Download Software

The CEL242 stores the sound level every second to its internal memory. It also stores a summary of the measurement, including start time, date, measurement duration and the maximum sound level.

The meter comes with software to download measurements in CSV format, which can be read directly into Excel or similar spreadsheet programs.

For more information about the software available for this meter please visit the Software tab.


An AC output and optional DC output mean this meter can be connected to a level recorder, PC equipped with an A/D converter or integrated with another data logging system.

CEL242 Applications

The CEL242 Data Logging Sound Level Meter is ideal for noise measurement applications that need the ability to store the measurements for download to a computer.

Occupational Noise - Noise in the Workplace

The US OHSA regulations demand the measurement of "Slow" Sound Level with "A" frequency weighting. The CEL242 provides these measurements, making it ideal for simple OSHA noise surveys. Using the data logging ability you can leave the meter running for a longer period to identify the times of the day when the noise exposure may be excessive.

Outside the USA many regulations demand the use of an integrating sound level meter. Even within the USA an integrating meter is advisable if the noise levels are not stable, as it will average out the variations in level, which is more reliable than averaging it by eye. Please see the Occupational Noise page for more information.

Fire Alarm Testing

The standards for fire alarm testing usually demand the measurement of the "A" weighted "Fast" sound level. The CEL242 sound level meter provides this measurement.

System Integration

As system intgration via the USB interface can be complex, the CEL242 has an AC output and an optional (free of charge) DC output, making it ideal for connection to a data logging system via a suitable A/D converter.

Environmental and Community Noise

This meter meets the strict requirements of the international standards to Type 2 or Class 2. This may be adequate for environmental work, but often these measurement standards and the authorities involved will expect the use of a Type 1 or Class 1 (more accurate) integrating meter. Environmental monitoring usually requires automatic, repeating measurements of, for example, 15 minutes or 1 hour. Data logging is really a necessity.

For suitable environmental noise monitoring solutions please visit our Environmental Noise Page.

Using It

The CEL242 Sound Level Meter is controlled using just two buttons, one to the left and one to the right. The graphical display ensures that operation and the selection of options is as easy as possible.

1. Switch On

Ensure 3 x AA batteries are fitted on press the red button to switch the sound level meter on. After a brief warm-period of just a few seconds, the meter will show the current sound level on the display.

The exact content of the display depends on how you set the meter up last time, as it remembers these settings for your convenience.

2. Calibration Check

Some regulations and guidelines state that the meter's calibration should be checked before making measurements, and that you should keep records of these calibration checks.

Fit the Calibrator over the microphone and switch it on. The meter automatically detects the presence and correct fitting of the Calibrator and then starts the calibration process, which only takes a few seconds.

3. Changing Settings

As the meter saves its settings, you should only need to do this occasionally. The left-hand button cycles through the following main settings:

Record DataStart recording the 1-second measurements
Display TypeGraph or numbers
Measurement Range30 to 100 dB or 60 to 130 dB
Time WeightingFast, Slow or Impulse
Frequency WeightingA or C weighting

The right-hand button is used to change the current setting of any of these parameters.

4. Make the Measurements

You can now read the sound level from the display.

Press the reset button (right-hand button) to reset the max reading.

Noise Software

As well as being ideal for making quick on-site noise measurements, the CEL242 can store the sound level every second. When downloaded to a computer this information can be used to produce a graph of the sound level over time.

There are three software options for the CEL242, with the most basic one being included free of charge with the meter.

CasellaDrive - Free of charge

  • Downloads to comma separated variable (CSV) file
  • Read files into Excel or similar software

NoiseMeters Applications

  • View measurements in a web browser
  • Easily produce, print and save detailed reports

dB24 Display Software

  • Show the sound levels in real-time on a computer screen
  • Store the sound level every second on computer

Casella Drive Software

This is available for free download with this meter. It connects to the sound level meter and presents the measurements in simple CSV files. The measurements can be copied to your hard drive for long term storage and can be loaded directly into Excel or similar spreadsheet program.

NoiseMeters Applications

The web based NoiseMeters Applications runs in your browser to produce noise reports from the measurements made with your CEL242 sound level meter. A small sync program runs on your computer and uploads the measurements to the web server. You simply login to view your reports.

To receive NoiseMeters Applications add NMAPPS to your order.

If you are unsure then you can purchase it at a later date. All we need is the serial number from your meter to register it online.


The CEL242 is a "general purpose" sound level meter, and so meets the international standards to Type 2 or Class 2. For any noise measurement that requires accurate, repeatable and comparable results, especially when used for hearing protection or other legal purposes, it is essential to use one that meets these standards.

Sound Level Meter Standards

  • ANSI S1.4 Type 2
  • IEC 60651 Type 2
  • IEC 61672 Class 2

Technical Specification

Measurement ranges30 to 100 and 60 to 130 dB
Noise floor< 33dB(A)
Time weightingsFast, Slow, Impulse
Freq. weightingsA and C
Battery power3 x AA Alkaline for >35 hours operation
External power5V via USB Mini B socket
Dimensions72 x 212 x 31mm, 245g
Tripod mount1/4" socket
AC output0.85V RMS @ FSD "A" weighted
DC output0 to 3.3V DC for FSD on selected range (FOC option)
Operating conditionsRH: 5 to 90% (non condensing)
Temperature: 0 to 40°C
Atmos. pressure 65 to 108kPa
StorageOver 4 days of time history
Max 18 hours/ measurement