Sound Level Meter

Sound Level Meter

for Noise at Work & Occupational Noise Measurements

Fast response from our specialists

Why buy from Geneq? - find out more


Model : CR:162A


Model : CR:161A


Model : CR:162B


Model : CR:161B


Model : CR:162C


Model : CR:161C


Model : CR:162D


Model : CR:161D

The optimus red sound level meters use the very latest digital technology and industrial design to give you the ideal instrument for Occupational and Industrial Hygiene noise measurements.


  • Occupational & Industrial Hygiene Noise Evaluations
  • Noise at Work Surveys & Noise Exposure Calculations
  • Hearing Protector Selection using HML or Octave Band Methods
  • Machinery Noise Tests
  • Noise Ordinance & Community Noise Assessments
  • General Noise Measurements

Key Features

  • Simple operation with an ergonomic design
  • Simultaneous measurement of all workplace noise parameters with additional two “virtual” noise meters
  • VoiceTag™ note recording*
  • AuditStore™ measurement verification*
  • Latest digital technology with a high resolution colour OLED display and back-lit keypad
  • Measure up to 140dB(A) and 143dB(C) Peak with a single measurement range
  • Real-time 1:1 Octave Band Filters*
  • NR & NC values & curves on screen*
  • Pause & Back Erase as standard
  • 4GB memory with the option of 32GB
  • Long battery life
  • Measure up to 170dB with the optional MV:200EH microphone system


For Occupational Noise and Industrial Hygiene, measuring the noise exposure of employees quickly and reliably is essential. The optimus red sound level meters are the ideal instrument for these applications with a clear, high resolution OLED colour screen, a wide 120dB measurement span (up to 140dB(A) and 143dBC Peak) and simultaneous measurement of all available parameters. There’s no setup or complicated configuration needed. Just switch on, calibrate and press start. It’s that simple.

VoiceTag audio recording

Before each measurement is made, you can record a VoiceTag by simply speaking into the microphone.
You can record notes about the measurement location, describe what is being measured or simply store information that may be useful at a later date.

The ideal instrument for any application

With two additional “virtual” noise meters running at the same time, you can meet any noise regulation, guideline or standard.
Whether you need to meet the UK and EU Regulations, measure to OSHA HC & PEL, MSHA, ACGIH or any other regulation, an optimus red is the ideal instrument.

Simple operation with advanced technology

The optimus sound level meters have been designed with ease of use as the most important feature which lets you get on with measuring and controlling the noise.

The instruments use the very latest in digital technology and industrial design techniques to make everything as clear and simple as possible.

The high resolution colour OLED screen can be seen in any conditions, and the keypad illuminates automatically in low light.

The case is robust and covered with a tactile finish so it can be used even if you’re wearing gloves.

The measurement data is displayed in a clear and simple format along with a realtime noise chart so that you can see how the noise varies with time.

All of the functions of the instrument are measured simultaneously, and with a wide 120dB measurement span you don’t need to worry about choosing the right range. An optimus can measure up to 140dB(A) and 143dB(C) Peak in this single range.

Just switch on, calibrate and you are ready to go.

The ideal solution for occupational noise

The optimus red sound level meters are the ideal sound instruments for occupational noise and industrial hygiene measurements, as well as for basic noise surveys, and will give you all of the information you need, right at your finger tips.
UK & EU Noise at Work Regulations
If you are working to the UK Control of Noise at Work Regulations or the EU Physical Agents (Noise) Directive, the Leq View gives you the information that you need.

The LAeq and LCPeak values are measured at the same time which allow the LEP,d (LEX,8h) and the Peak Action Levels to be determined.

The LCeq-LAeq (C-A) value is also measured which can be used to select PPE using the HML method. LAE is also measured along with LZPeak for regulations that use this rather than LCPeak.
OSHA,MSHA & other regulations
If you need to meet regulations such as OSHA HC & NC, MSHA HC or ACGIH, the two “virtual” noise meters in the Dose View can be quickly configured to provide you with this information.

The Quick Setup gives access to a number of preset functions including OSHA HC & NC, OSHA HC & ACGIH and MSHA HC & EC. The custom settings can be used to choose any other setup or configuration that you may need.

Once you’ve chosen the setup needed it will be stored so each time you use the meter you will have the information you need. For the two “virtual” noise meters, the LAVG, TWA, % Dose and Estimated % Dose are displayed.
Octave Band Filters for Noise Control & Selecting Hearing Protection
The C & D instruments also feature real-time octave band filters which will measure the noise in 10 different frequency bands.

The octave band measurement is made at the same time as the other measurements and includes the overall level in each band along with a time history of the bands across the measurement period.
NR & NC values & curves on screen
The D variants add NR & NC values and curves to the 1:1 octave band measurements. This information can be useful in checking the performance of HVAC systems and noise levels in rooms.
Basic noise level measurements
The optimus red instruments can also be used for basic noise measurements where the Sound Level is required, such as community and noise ordinance enforcement and testing of fire and emergency alarms.
Class 1 & Class 2 performance
Where precision measurements are needed, Class/Type 1 instruments are available as well as the General Purpose Class/Type 2 instruments.
Data logging & PC download
If there is a need to record and download measurements to a PC, data logging is available with the B, C & D version instruments. These units are supplied with the NoiseTools software and a USB data cable to allow the measurement information to be downloaded.


NoiseTools Software

The NoiseTools software package gives you a quick and simple way to download, analyse and report your noise measurement information.

The initial summary screen shows you the most commonly used information and, through simple icons, gives you access to the detailed measurement data. You can simply print the summary screen to get a quick measurement report.

For advanced users, each and every function measured by the instrument is available for review and analysis and the data can be exported for further use.

VoiceTag audio recordings can be played back for reference and are automatically stored with the measurement data. Where Octave Band data is available, this information can be used by the program to calculate the level of protection from a range of hearing defenders and ear plugs.

To help you keep your noise measurement data organised and easy to find, NoiseTools allows each measurement to be allocated to people, places and projects.

Measurements can be sorted or grouped by any parameter, person, place or project and measurement reports created quickly and easily.

NoiseTools is supplied free from any licensing restrictions or limits allowing you to install the program on as many PC’s as needed at no additional cost.

AuditStore data verification

AuditStore™ is a new technology that helps you to ensure that your noise measurement data is valid and trustworthy. AuditStore allows the user to verify measurements that have been downloaded to the NoiseTools software against a secure data store within the instrument.

Each time you make a measurement with your optimus, a selection of the overall data is stored into a separate, secure memory that is independent of the main memory card.

This data contains essential information about the measurement such as the time, date and duration, the LAeq, Peak(C) and LAFmax, LA10 & LA90 (where available) and the overload indication.

In addition to the noise measurement data, information about the last calibration is also stored.

The AuditStore data can be downloaded from the instrument when required and then the measurements can be checked against the AuditStore.

The NoiseTools software will check that the measurement information held in the main database and displayed on the screen matches the values within the AuditStore secure memory.

NoiseTools will display verification symbols if the information matches, a unique feature which will be useful in any legal proceedings.

Instrument Range & Measurement Kits

The optimus red comprises the A, B, C and D variants, each of which can be specified as either Class 1 or Class 2. All of the instruments can measure Sound Level functions plus Lmax and Lmin with all frequency and time weightings.

The A versions measure the Integrated noise levels such as Leq and LAE, C-A, Peak Sound Pressure and the virtual noise meters for OSHA/MSHA/ ACGIH.

The B versions provide the same functions as above but with the addition of Data Logging so that measurements can be downloaded to the NoiseTools software. The VoiceTag audio recording is available on the B versions.

The C versions add Real Time Octave Band Filters to the functions of the B versions which can be used for the selection of hearing protection. The D variants add NR & NC values and curves directly on the instrument display.

Specifications and a selection chart are available on the following page.

Complete measurement kits are available for the optimus instruments which contain the instrument, an acoustic calibrator, windshield, cables, batteries and accessories. The measurement kits contain all of the accessories needed to carry out a noise survey.



Class 1    
Class 2    
Type Approval to
IEC 61762-1
Sound Level
Pause &
Back Erase
VoiceTag Note
1:1 Octave
Band Filters
Curves on screen
Software Support  
Measurement KitCK:162ACK:161ACK:162BCK:161BCK:162CCK:161CCK:162DCK:161D

Standard Accessories

The optimus sound level meters are supplied, as standard, with the following accessories:

  • User Manual
  • Certificate of Calibration
  • USB Data/Power Cable
  • Windshield
  • NoiseTools Software CD (Requires B, C or D Version to download measurements)


Measurement Kits

The optimus sound level meters are available as a complete measurement kit with the following accessories:

  • optimus Sound Level Meter
  • CR:514 Class 2 or CR:515 Class 1 Acoustic Calibrator
  • UA:237 90mm Windshield
  • CK:300 Carrying Case
  • User Manual & Certificates of Calibration
  • USB Data/Power Cable & NoiseTools Software CD (Requires B or C Version to download measurements)
Applicable StandardsIEC 61672-1:2002 Class 1 or Class 2 Group X
IEC 60651:2001 Type 1 I or Type 2 I
IEC 60804:2000 Type 1 or Type 2
IEC 61252:1993 Personal Sound Exposure Meters
ANSI S1.4 -1983 (R2006),ANSI S1.43 - 1997 (R2007)
ANSI S1.25:1991
1:1 Octave Band Filters to IEC 61260 & ANSI S1.11-2004 (C & D variants)
MicrophoneClass 1 MK:224 pre-polarized, Class 2 MK:216 pre-polarized
Microphone PreamplifierMV:200 Removable Preamplifier (All versions)
Total Measurement Range:20dB to 140dB RMS Single Range
Noise Floor: <18dB(A) Class 1, <21dB(A) Class 2
Frequency WeightingsRMS & Peak : A, C, & Z Measured Simultaneously
Frequency Bands: 10 Octave Bands (31.5Hz to 16kHz, C & D variants)
Time WeightingsFast, Slow & Impulse Measured Simultaneously
DisplayHigh resolution OLED display. Ambient light sensor & illuminated keypad
Memory4GB (B, C & D Versions),32GB factory fit option
AuditStoreMeasurement verification data stored in secure memory
Time History Data Rates
(Global settings)
10ms, 62.5ms, 125ms, 250ms, 1/2 sec, 1 sec, 2 sec (User selectable)
VoiceTag Audio Recording
(B, C & D Versions)
Up to 30 seconds of audio notes with each measurement
IntegratorsThree simultaneous “virtual” noise meters. Integrator 1 is preset to Q3 for Leq functions. Integrators 2 & 3 can be configured with the following:
  • Exchange Rate: 3, 4 or 5 dB
  • Threshold: 70dB to 120dB (1 dB steps)
  • Time Weighting: None or Slow
  • Criterion Level: 70dB to 120dB (1 dB steps)
  • Criterion Time: 1 to 12 hours in 1 hour steps
Integrator Quick
MSHA HC & MSHA EC, Custom 1 & Custom 2
Measurement controlPause & Back Erase with user selectable duration
  • Size: 283mm x 65mm x 30mm
  • Weight: 300gms/10oz
Batteries4 x AA Alkaline
Battery lifeTypically 12 hours with Alkaline AA
Typically 20 hours with Lithium AA Non-Rechargeable
Battery life is dependent upon the battery type, quality & screen brightness
ConnectionsUSB Type B to PC
AC & DC Output via ZL:174 (2 x Phono, 1m)
Multi-pin IO for external power via ZL:171 cable (2.1mm socket)
External Power: 5v-15v via MultiIO socket via ZL:171 cable (2.1mm socket)
Tripod Mount1/4” Whitworth socket
CaseMaterial: High Impact ABS-PC with soft touch back & keypad
  • Temperature: Operating -10°C to +50°C, Storage -20°C to +60°C
  • Humidity: Up to 95% RH Non Condensing
IEC 61672-1:2002 & IEC 61672-2:2003
Except where modified by EN 61000-6-1:2007 & EN 61000-6-1:2007
Language optionsEnglish, French, German, Spanish. Other language options may be available
Software SupportNoiseTools Download, Configuration & Analysis software supplied as standard. Compatible with Microsoft Windows XP, Vista, 7 & 8 (32bit & 64bit)
Measurement Functions
CR:162A & CR:161A
Displayed Functions
LXY, LXYMax, LXYMin, LXeq, LCPeak, LZPeak, LCeq-LAeq, LXE
Graph of Short LAeq, LCPeak
Integrators 2 & 3: TWA, Dose%, Est Dose%
Measurement Run Time
CR:162B & CR:161B
Displayed Functions
LXY, LXYMax, LXYMin,LXeq, LCPeak, LZPeak, LCeq-LAeq, LXE, LAIeq
Graph of Short LAeq, LCPeak
Measurement Run Time
Integrators 2 & 3: TWA, Dose%, Est Dose%
Stored FunctionsLXYMax & Time History of LXYMax
LAeq, LCeq, LZeq, LCPeak, LZPeak, LAPeak
Time History of LAeq, LCeq, LZeq, LCPeak, LZPeak, LAPeak, LAIeq
Integrators 2 & 3: LAVG , TWA. %Dose
Time History of LAVG
CR:162C & CR:161C
Displayed Functions
LXY, LXYMax, LXYMin, LXeq, LCPeak, LZPeak, LCeq-LAeq, LXE, LAIeq
Graph of Short LAeq, LCPeak
Measurement Run Time
Integrators 2 & 3: TWA, Dose%, Est Dose%
Real-Time Octave Band Filters
Stored FunctionsLXYMax & Time History of LXYMax
LAeq, LCeq, LZeq, LCPeak, LZPeak, LAPeak
Time History of LAeq, LCeq, LZeq, LCPeak, LZPeak, LAPeak, LAIeq
Integrators 2 & 3: LAVG , TWA. %Dose
Time History of LAVG
Octave Bands: Overall Leq & Leq Time History for each band
Measurement Run Time
Time & Date of Measurement Start
CR:162D & CR:161D
Displayed Functions
LXY, LXYMax, LXYMin, LXeq, LCPeak, LZPeak, LCeq-LAeq, LXE, LAIeq
Graph of Short LAeq, LCPeak
Measurement Run Time
Integrators 2 & 3: TWA, Dose%, Est Dose%
Real-Time Octave Band Filters
NR & NC values & curves
Stored FunctionsLXYMax & Time History of LXYMax
LAeq, LCeq, LZeq, LCPeak, LZPeak, LAPeak
Time History of LAeq, LCeq, LZeq, LCPeak, LZPeak, LAPeak, LAIeq
Integrators 2 & 3: LAVG , TWA. %Dose
Time History of LAVG
Octave Bands: Overall Leq & Leq Time History for each band
NR & NC values & curves
Measurement Run Time
Time & Date of Measurement Start

where x=A ,C ,Z; y= F, S, I
Other functions may calculated by the NoiseTools software and displayed on download.

1. For details of the displayed and stored parameters, please refer to the optimus user manual. All specifications, features and values are typical and are subject to change without notice.