Cygnus Instruments

Ultrasonic Thickness Gauges

Cygnus Ultrasonic Thickness Gauges all measure using the Multiple-Echo Technique for accurate error-checked metal thickness measurements.  This uses multiple pulses, providing verified thickness readings and allowing coatings up to 20 mm thick to be ignored.

Our range now includes several PLUS+ models which feature additional measuring modes:

  • Echo-Echo mode uses two sound pulses, ideal for improved detection of heavy back wall corrosion and pitting while ignoring coatings up to 1 mm
  • Single-Echo mode uses one sound pulse, ideal for measuring extreme front face or back wall corrosion and pitting through uncoated surfaces.

This provides added flexibility and increases even further the scope of thickness gauging applications Cygnus thickness gauges can be used in.

From the Intrinsically Safe thickness measuring gauge designed for use in explosive atmospheres to the ROV mountable gauge, the Cygnus product range has an ultrasonic thickness gauge designed for any application and industry – including the toughest of environments.

Our Surface range of thickness gauges includes Intrinsically Safe for potentially explosive environments; Hands Free for rope access applications; Data Logger for simple yet versatile logging of thickness measurements; General Purpose with large LCD display and simple menu operation; and the extremely rugged Heavy Duty corrosion thickness gauge.

  • Cygnus 1 Intrinsically Safe

    Cygnus 1 Intrinsically Safe

    Cygnus 1 Intrinsically Safe is an ultrasonic thickness gauge designed for measuring metal thickness and corrosion in potentially explosive environments.

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  • Cygnus 2 Hands Free

    Cygnus 2 Hands Free

    The latest Cygnus 2 Hands Free ultrasonic thickness gauge is designed for use in rope access or belt-mounted applications and has been tested to the toughest levels of US Mil STD 810G.

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  • Cygnus 2+ Hands Free

    Cygnus 2+ Thickness Gauge

    The latest Cygnus 2+ Hands Free multi-mode ultrasonic thickness gauge, designed for rope access or belt-mounted applications, now incorporates three versatile measuring modes: Multiple-Echo; Single-Echo; and Echo-Echo.

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  • Cygnus 4 General Purpose

    Cygnus 4 General Purpose

    Tested to the toughest levels of US Mil STD 810G, the latest Cygnus 4 General Purpose gauge is ideal for most hand-held industrial or shipping inspection applications.

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  • Cygnus 4+ General Purpose

    Cygnus 4+ General Purpose

    Incorporating three versatile measuring modes, sequential data logging and an A-scan display, the latest Cygnus 4PLUS is ideal for most hand-held industrial or shipping inspection applications.

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  • Cygnus 6+ PRO

    Cygnus 6+ PRO

    Incorporating three versatile measuring modes, comprehensive data logging as well as A-scan and real-time B-scan display. The latest Cygnus 6PLUS is ideal for most hand-held industrial or shipping inspection applications.

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  • Cygnus Heavy Duty

    Cygnus Heavy Duty

    The Cygnus Heavy Duty is a really rugged thickness gauge that is simple to use enabling accurate metal thickness gauging in harsh environments.

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The Subsea range of thickness gauges consists of the wrist-mounted DIVE and the handheld Underwater thickness gauges for diver use; ROV mountable series for use on small, medium to large ROVs with optional probe handling solutions.

  • Cygnus DIVE Underwater Gauge

    Cygnus DIVE Underwater Gauge

    The Cygnus DIVE wrist-mountable thickness gauge now has a new large, brightly coloured AMOLED display for easy viewing from all angles for the diver and his camera, even in poor visibility. With live A-scan for measurement verification.

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  • Cygnus Underwater

    Cygnus Underwater

    Cygnus Underwater is a tough multiple echo Ultrasonic Thickness gauge from Cygnus Instruments, designed for use by divers undertaking subsea surveys.

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  • Cygnus ROV Mountable

    Cygnus ROV Mountable

    Cygnus Instruments offers two dedicated ROV mountable multiple echo ultrasonic thickness gauges designed to measure metal thickness in the harshest operating conditions.

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  • Cygnus Mini ROV Mountable

    Cygnus Mini ROV Mountable

    Designed in conjunction with VideoRay, the Cygnus Mini ROV Mountable gauge enables thickness testing previously infeasible using large ROVs and divers.

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We manufacture gauges in housings designed for specific inspection environments, including underwater and hazardous areas.  Please see our applications section for further details.

Manufactured in the UK, all our thickness gauges are very simple to use and are built to last (3 year warranty supplied).

ROV Probe Handlers

When using one of the ROV Mountable Thickness Gauges it is often useful to mount the probe into a Probe Handler.  We produce three types which all help to protect the probe face when it is being flown up to the surface being measured and assist in keeping it as still as possible in this environment where everything is constantly moving. 

For more information, please go to our ROV Probe Handlers and Gauges page.

Ultrasonic Probes / Transducers

All Ultrasonic Thickness Gauges are used with a probe also know as a transducer and a cable.  The probe face is placed on the material being tested and within the probe an element vibrates to generate ultrasound.  A single crystal probe is used for taking measurement in Multiple-Echo mode and a twin crystal probe is used for Echo-Echo and Single-Echo modes.

Please see our Ultrasonic Probes page for more information including their sizes, frequencies and measuring ranges.


Cygnus supply a range of accessories to assist with thickness gauge inspections.  These include couplant, calibration and test blocks, tools for any surface preparation required and also a manual pit gauge for measuring the depth of pits. 

Please visit our Accessories page for further details.


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