The Optimus+ Sound Level Meter

Designed with ease-of-use as an absolute priority, the Optimus+ range of sound level meters from Cirrus Research makes measuring and monitoring noise easier than ever before.

Established in 1970, Cirrus Research is dedicated to the measurement of noise, and the prevention of health issues caused by exposure to excessive noise levels.

Key BenefitsTestimonials

Reviews that speak voumes

Why Choose the Optimus+?

Designed and manufactured in the UK, the Optimus+ range of instruments offers accuracy and reliability paired with superior functionality, to make your job of noise monitoring much simpler. With so many features, the Optimus+ is the last sound level meter you'll ever need to buy.

Models for every situation

With the Optimus Yellow, Red and Green all suited for different situations, you'll only get exactly what you need: nothing more, nothing less.

Easy-to-use and gimmick-free

With a bright screen and large buttons, the Optimus can be operated by anyone with a minimal amount of training. We're here to make your job easier and the Optimus does exactly what you need it to do.

Regulation compliant

No matter where you are in the world, all Optimus instruments are fully-compliant with health and safety regulations across the world.

There is nothing out there that can rival the Optimus Sound Level Meter for its intuitive technology and accuracy.

Nick Phillips

Manufacturing Manager at lmor Engineering

Which Optimus is right for you?

From capturing basic noise data to measuring and monitoring environmental noise at construction sites and airports, there's an Optimus sound level meter perfect for you.

A basic sound level meter

Manufactured to British standards, the Optimus Yellow is perfect for those who just need to capture very basic noise data.

Provides the maximum sound level

The Optimus Yellow records the maximum sound level (LMax) in decibels, which can help you identify noise hotspots.

Perfect for:

  • Factory personnel
  • Alarm installers
  • Fire alarm noise level testing
  • Community noise assessments
  • Machinery servicing and maintenance
  • Noise ordinance servicing

Designed to comply with Noise at Work Regulations

The Optimus Red sound level meter is the perfect instrument to use for occupational noise surveys, as it has been specifically built to meet the UK Noise at Work Regulations 2005.

Perfect for:


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Our top-spec sound level meter

The Optimus Green sound level meter is the top-of-the-range device available from Cirrus Research, featuring all the capabilities of the Yellow and Red instruments, plus so much more!

For environmental noise monitoring

Perfect for:

Optimus Yellow

Optimus Red

Optimus Green

Meets international standards

The Optimus Red also meets European Union regulations, as well as OSHA, HC & PEL, MSHA and ACGIH guidelines in the United States.

  • Health and safety officers
  • Noise at work surveys
  • Ensuring compliance with health and safety legislation
  • Measuring noise levels of machinery, heavy equipment and vehicles
  • Measuring noise levels in the entertainment industry

The Optimus Green can be used as a handheld meter or in one of our outdoor measurement kits as a long-term monitoring solution.

  • Environmental health officers
  • Health and safety officers and consultants
  • Airport and aircraft noise monitoring
  • Construction site noise monitoring
  • Entertainment venue noise monitoring
  • Wind farm noise monitoring
Get your quote or find out more

Make a sound decision. Choose Optimus+.


All Optimus+ instruments

 All instruments come with Bluetooth connectivity, allowing them to be used remotely though the dBActive smartphone application; you can start/stop measurements and view live data without needing to look at the instrument itself. The Optimus+ can also record noise at a tenth of a second intervals, which makes it perfect for monitoring wind farm noise.

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