The Ideal Solution for Simple Noise Measurements Optimus Yellow Sound Level Meters
The Optimus yellow instruments are a range of state-of-the-art sound level meters that have been designed to meet the very latest standards for noise measurement instruments.
It has been purposed-designed for applications where only basic noise data is required, such as Sound Level (SPL) or Maximum Sound Level (Lmax). These applications include fire alarm testing, machinery servicing and noise ordinance enforcement.
See what the Optimus Yellow can do for you. Use the form to contact our Noise Experts today.
Why Choose Optimus Yellow?
- Backed by our 15 Year "No Quibble" Warranty for your peace of mind
- Product training available from £125
- High Performance to Class 1 or Class 2 Standard
- Quick, Simple and easy to operate
- Fast, Slow & Impulse Time Weightings
- dB(A), dB(C) and dB(Z) Frequency Weightings
- VoiceTag™ voice note recording
- AuditStore™ measurement verification
- High resolution colour OLED display and back-lit keypad
- Measure up to 140dB(A) and 143dB(C) Peak with a single 120dB measurement range
- Pause & Back Erase as standard
- 4GB memory with the option of 32GB
- Long battery life
Noise Measurement Made Easy
We want to make your job easier, so we designed to Optimus Yellow to offer the highest level of performance without the complicated setup.
- Every parameter is measured simultaneously, so you can't choose the wrong function or miss any data
- All it takes is 3 button pushes to get the Optimus Yellow to start measuring. Switch On. Calibrate. Start. It's that simple
- With it's large OLED display, you can easily view your measurements
Downloading Your Data is Simple
If you need the data logging version of the Optimus Yellow, we'll include our NoiseTools noise analysis software so you can keep a record of your measurements. View the full specifications on the product table below.
Get More Infomation
What our customers say..
It is a first class instrument and should be the prime tool of all environmental and occupational health officers...
Which Optimus Yellow is right for you?
There are 4 versions of the Optimus Yellow Sound Level Meters, 2 with Class 2 performance and 2 with Class 1 performance.
The table below shows the different versions and options available with each instrument.
You can also use our interactive Optimus Product Selector to find the best instrument for you.
Find out more
If you have any questions or if you would like any more information, please contact us and we will be pleased to help.
Please call us on
+44 1723 891655.
You can also contact us via our contact form.
DownloadsOptimus Yellow Sound Level Meters (EN)
Optimus Yellow Sound Level Meters (CN)
Sonómetros Optimus Yellow (España)
Optimus Yellow Sound Level Meters (DE)
IEC 61672-1:2002 Class 1 or Class 2 Group X
IEC 60651:2001 Type 1 I or Type 2 I
ANSI S1.4 -1983 (R2006), ANSI S1.43 - 1997 (R2007)
Class 1 MK:224 pre-polarized, Class 2 MK:216 pre-polarized
MV:200 Removable Preamplifier (All versions)
Total Measurement Range:
20dB to 140dB RMS Single Range
Noise Floor: <18dB(A) Class 1, <21dB(A) Class 2
RMS & Peak : A, C, & Z Measured Simultaneously
Fast, Slow & Impulse Measured Simultaneously
High resolution OLED display. Ambient light sensor & illuminated keypad
4GB (B Version), 32GB factory fit option
Measurement 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 Version)
Up to 30 seconds of audio notes with each measurement
Pause & Back Erase with user selectable duration
Size: 283mm x 65mm x 30mm
4 x AA Alkaline
Typically 12 hours with Alkaline AA
Typically 20 hours with Lithium AA Non-Rechargeable
Battery life is dependent upon the battery type, quality & screen brightness
USB 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)
1/4" Whitworth socket
Material: 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
English, French, German, Spanish. Other language options may be available
NoiseTools Download, Configuration & Analysis software supplied as standard. Compatible with Microsoft Windows XP, Vista, 7 & 8 (32bit & 64bit)
CR:152A & CR:151A
LXY, LXYMax, LXYMin
Measurement Run Time
CR:152B & CR:151B
LXY, LXYMax, LXYMin
Measurement Run Time
LXYMax & Time History of LXYMax
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.