Assessor 81CA Class 1 Integrating Noise Level meter

The Assessor 81CA is an Integrating Noise Level Meter ideal for calculating hearing protection (PPE) using the HML method. 

Also available with added data logging option. 

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This Class 1 meter uses ‘C’ and ‘A’ weighted Leq values and the HML method of calculating required hearing PPE. It is a good choice for people in need of a highly accurate meter, but who do not want to pay extra for an instrument with 1:1 Octave band filters. Also available with data logging.

Integrating Noise Level Meter

Expanding on the basic models in the Assessor range, the Models 81CA Class 1 Noise Level Meter combines highly accurate affordable noise measurement and compliance with International Industrial Noise Directives.

The Model 81CA (Class 1) meter is an ideal instrument for safety professionals who not only want the accuracy from a Class 1 instrument, but want to use the established and accepted HML (High, Medium, Low) method for calculating hearing protection accurately without the addition of expensive 1:1 Octave Band Filters. 

All hearing protection (PPE) should be supplied by the manufacturer with attenuation (reduction) values for each of the H, M and L values. By knowing the ‘C’ and ‘A’ weighted Leq values and the difference between them you can use either a spreadsheet or simple formula to select suitable hearing protection for your workforce.

C-A Measurement Mode

You can switch between broadband measurements and C-A Measurement mode just by pressing the C-A button. A Blue indicator shows that you are now measuring in C-A mode rather than the normal Broadband mode.

The meter will make an Leq measurement with dB(C) weighting (LCeq) and will continue until the average level has settled. When the level has settled, the instrument will switch to dB(A) and repeat the process with ‘A’ weighting.

When this level has also settled, the instrument will display the LCeq, LAeq and in large digits the resultant LCeq – LAeq value on screen. Making this type of measurement has never been easier, as everything is done in an automatic cycle for you.


  • The Model 81CA (Class 1) meter has all the features of the Assessor 81A but with the addition of an affordable and legally compliant way of specifying hearing protection.
  • Ideal for HML method for calculating hearing protection
  • Hearing protection measurements have never been easier; the C-A mode ensures automatic measurement calculation
  • Software upgrades available
  • Non-data logging option available


The Assessor range of noise level meters focuses on one main purpose and that is for compliance with International Industrial Noise Directives. This mindset has produced an extremely effective noise measurement tool for the busy Health & Safety Professional, Industrial Hygienist, Consultant, Manager, Supervisor, Technician or Engineer.

  • Noise at work
  • Industrial Hygiene
  • Quick Spot Checks


The ‘Analyser’ sound analysis software package is optional with the Model 81CA. The units are supplied as non data logging with the option of upgrading at a later date.  Alternatively it can be supplied with the upgrade already fitted.

This exceptional sound analysis software Pulsar Analyser package enables users to download quickly noise measurements to their computer and transform them into informative and professional reports.

The Pulsar Analyser software also has a special database of hearing protectors that allows the user, at the click of a button, to have all calculations done for you automatically. A selection of hearing protection is listed and a report can be compiled.

This software is compatible with Windows 9x/Me/2000/NT/XP and Vista.

The Model 81CA noise level meter comes supplied with the following sound measurement equipment:

  • 12-month warranty
  • Operating manual
  • Certificate of calibration
  • Battery

The instrument can be supplied as part of a complete noise measurement kit, containing all that is required to carry out a noise survey.

Each Model 81CAK (Class 1) noise measurement kit contains:

  • Model 81CA Meter
  • Model 105 (Class 1) Acoustic Calibrator
  • WS90 Windshield
  • K2 Hard Attache Case
  • Wrist Strap, Batteries (2 X AA)
  • Calibration Certificate for the sound level meter and its acoustic calibrator
  • ‘Analyser’ download, analysis and reporting software and USB download cable (with upgrade versions only)
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