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CR:171B Class 1 SLM, Data Logging, Audio Recording, 1:1 & 1:3 Octave Bands

CR:171B Class 1 SLM, Data Logging, Audio Recording, 1:1 & 1:3 Octave Bands


Environmental and Occupational Noise measurements.

Ideal for:

  • Environmental noise impact assessments
  • Occupational & Industrial Hygiene Noise Evaluations
  • Hearing Protector Selection using HML or Octave Band Methods
  • Tonal analysis using 1:3 Octave Band Filters
  • Detailed analysis using audio recording
  • Noise Ordinance & Community Noise Assessments
  • General Noise Measurements


  • LXY, LXYMax, LXYMin
  • LXeq, LCPeak, LZPeak, LAPeak, LCeq-LAeq, LXE, LAIeq
  • Graph of Short LAeq, LCPeak
  • Integrators 2 & 3: TWA, Dose %, Est Dose %
  • Real-Time 1:1 Octave Bands (Graphical & Numeric)
  • Real-Time 1:3 Octave Bands (Graphical & Numeric)
  • Tonal Noise Detection in 1:3 Octave Bands
  • NR & NC values & curves
  • Leq LF (20Hz to 200Hz)
  • Up to 28 Statistical Ln% Values
  • Time History of LXYMax, LAeq, LCeq, LZeq, LCPeak, LZPeak, LAPeak, LAIeq, LAVG, 1:1 Octave Bands, 1:3 Octave Bands
  • Tonal Noise Detection in 1:3 Octave Bands
  • Audio recording during measurement
  • Time, date & duration of measurement

Where X=A, C & Z Frequency Weightings and Y=F, S & I Time Weightings. All frequency & time weightings are measured simultaneously. Time history stored by data logging versions only. 1:1 Octave Bands (A, B & C Versions), 1:3 Octave Bands (B & C Versions), Tonal noise detection (C Versions), NR & NC curves (A, B & C Versions)

  • Product Info

    A Total Solution for Occupational and Environmental Noise Measurements: Optimus Green Sound Level Meters

    Do you need an all-in-one solution for your noise measurements? The Optimus Green gives you all the noise data you could possibly need for both environmental and occupational noise.


    By measuring every parameter you need simultaneously, the Optimus Green records everything in one measurement. There's no risk of choosing the wrong function or missing any data. All you need to do to get going is switch on, calibrate and start. It's that simple.


    All of your measurement data displays on the large OLED screen. You'll be able to see straight away if there are any noise issues that need further investigation. You can easily navigate screens during measurements to see the data you need.


    Whether it's environmental noise monitoring, detailed noise analysis using audio recording or workplace noise measurements, the Optimus Green has you covered.


    Why Choose the Optimus Green?

    • Backed by our 15 Year "No Quibble" Warranty for your peace of mind
    • High Performance to Class 1 or Class 2 Standard
    • Quick, simple and easy to operate
    • Simultaneous measurement and data logging of all available parameters
    • Measures Fast, Slow & Impulse Time Weightings
    • dB(A), dB(C) and dB(Z) Frequency Weightings included
    • Real-time 1:1 & 1:3 Octave Band Filters
    • Tonal noise analysis
    • VoiceTagTM voice note recording
    • AuditStoreTM measurement verification
    • Acoustic FingerprintTM audio triggering, recording & alerts during measurements for replay and analysis
    • Compatible with CK:670 & CK:680 environmental noise monitoring kits for a total environmental noise monitoring solution
  • Downloads

  • Delivery

    We aim to Delivery products with you within 4 weeks of receipt of order. However, in exceptional circumstances delivery may be up to 6 weeks due to manufacturer lead times. Please inform us if you require fast delivery as we will do our utmost to expedite your order.

  • Quantity Orders

    Please contact us directly to discuss quantity purchases and additional discounts.  We will subsequently provide you with a formal quote with the applied discount, which will be valid for 30 days 

  • Hire

    Many of the products you have seen are available for hire, so feel free to contact us if you would prefer to hire this instrument.

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