Cygnus DIVE Underwater Gauge

Ultrasonic Thickness Gauge

A robust, wrist-mountable ultrasonic underwater thickness gauge, providing an invaluable free hand while performing Ultrasonic Thickness Measurement (UTM) underwater. The Cygnus DIVE also offers a large, bright display with live A-scan which is easily viewable by both the diver and his camera - even in the poorest visibility.

Key Features of the Cygnus DIVE Underwater UTG

  • Multiple-Echo mode for accurate, through-coat measurements as specified by Classification Societies
  • Single-Echo and Echo-Echo modes for heavily corroded metals with a thin or no coating
  • Deep-Coat function to ignore coatings up to 20 mm (0.8 inch) thick
  • A-scan display to assist with measurement verification
  • Optional Data Logging feature with AutoLog – storing up to 5,000 measurements including A-scan data without pressing any button
  • MSI™ (Measurement Stability Indicator) verifies stable, reliable readings
  • Rechargeable lithium-ion battery giving up to 10 hours continuous measurement
  • Optional remote display HelmetView™, Topside Repeater and CygLink surface display software.

Three Versatile Measuring Modes

  • Multiple-Echo mode uses three error checked back wall echoes to provide the most reliable and accurate remaining thickness measurements, with no need to remove coatings (up to 20 mm thick (0.8 inch))
  • Single-Echo mode is ideal for measuring uncoated metals with heavy front and/or back-wall corrosion. Also effective on a range of cast metals, plastics and composites
  • Echo-Echo mode works best for measuring heavily corroded metals through thin coatings of up to 1 mm (0.04 inch) thick, ideal for measuring painted metals with heavy back wall corrosion.

Measurement Stability Indicator (MSI™)

Exclusive to Cygnus, MSI™ ensures stable and therefore reliable measurements are displayed in Echo‑Echo and Single-Echo modes.

CygLink Computer Software

CygLink is a Windows® based application used to transfer and manage data logger records, A-scans, measurement comments and material velocity tables. The program can generate PDF reports and export to Excel. It also displays A‑scans, allowing for after-the-event analysis of logged measurements.

The latest version of CygLink software is available to download from ‘Software Downloads’.

Display2.8” quarter VGA colour LCD (320 x 240 pixels). Large clear thickness measurement (15 mm high numbers), viewable from all angles.
A-scan display with automatic X axis. Battery level, signal strength, probe type, velocity. Measurement mode and units indication.
BatterySingle 3.6V Li-ion 8.2 W battery. 10 hours continuous measurement
Low battery warning ‘alert’ message
Measuring ModesMultiple-Echo using 3 echoes to ignore coatings up to 20 mm (0.8 inch) thick.
Echo-Echo using 2 echoes to ignore coatings up 1 mm (0.04 inch) thick.
Single-Echo using 1 echo
Deep CoatIn Multiple-Echo mode, allows measurement to be made through thicker coatings of suitable materials of up to 20 mm (0.8 inch) thick
Accuracy±0.1 mm or 0.1% of thickness measurement, whichever is greatest, when calibrated in accordance with Cygnus Instruments calibration procedure
Probe OptionsSingle crystal probes and Twin crystal probes
Probe CablesDouble outer jacket in tough PU. Coloured yellow for easy locations underwater
Coiled for ease of use. Fischer S105 series connectors
Measurement Range in Steel1 – 250 mm (0.039 – 10 inch) depending on selected probe and configuration, material and temperature
Measurement ResolutionMultiple-Echo with single crystal probes – 0.1 or 0.05 mm
Single-Echo and Echo-Echo with twin crystal probes – 0.1 or 0.01 mm
Measurement Unitsmm or inches
Probe ZeroFully automatic probe zeroing for all probes types
V-Path CorrectionAutomatic V-Path correction for all twin crystal probes
Velocity Range2,000 to 9,000 m/s in 1 m/s steps
PulserTwin channel 70 V spike pulser
Receiver / Amplifier
10 MHz bandwidth, 120 dB range, automatic TCG
60 MHz measurement time-base
Data Logging (Optional)
One-handed automatic logging of stable measurements.  Capacity for up to 5,000 points including 640 point A-Scan data.
Data OutputRS-485 single pair, half duplex for surface connection
StandardsDesigned for EN 15317
ComplianceCE, UKCA, RoHS
Warranty3 years on gauge and 6 months on probe
  • Cygnus DIVE Gauge Body and Wrist Strap
  • Ultrasonic Probe(s) with Coiled Cable
  • Two Rechargeable Batteries
  • Membrane Couplant, 25 ml bottle
  • Battery Charger and Charger Base
  • AC Mains Lead for Battery Charger
  • Ultrasonic Couplant Gel (Blue), 100 ml bottle
  • Test Block 15 mm (or ½ inch) thick in Mil Steel
  • Spare Probe Membranes
  • Membrane Key
  • Silicone Grease, 50g tube
  • USB Flash Drive with Documentation
  • Calibration Certificate
  • Operating Manual.
Weight5 kg

Cygnus DIVE Gauge Standard Kit with S2C 2.25MHz 13mm Standard Probe, Cygnus DIVE Gauge Standard Kit WITHOUT PROBE, Cygnus DIVE Data Logging Gauge Kit with S2C 2.25MHz 13mm Standard Probe, Cygnus DIVE Data Logging Gauge Kit WITHOUT PROBE

To compliment our ultrasonic thickness gauges we offer a range of ultrasonic probes. The performance of any ultrasonic thickness gauge relies heavily on the probe and its suitability to the material being measured. Therefore, selecting the right probe is vital. All Cygnus’ probes are made from stainless steel and have a hard wear face or a wear membrane to protect the probe.


Variety of Cygnus INOX Probes

  • Stainless steel SINGLE CRYSTAL probes, used in multiple-echo mode, include replaceable membranes for long life, require no zeroing and have a high linear accuracy.
  • Stainless steel TWIN CRYSTAL probes, used in echo-echo and single-echo modes, have improved measurability on extreme back wall corrosion and pitting.


Single Crystal Probes


Twin Crystal Probes

Topside Repeater (TSR) Remote Display Unit

The Cygnus Topside Repeater is a remote display unit connected to the DIVE gauge with an umbilical cable. It displays the thickness measurements at the surface in real-time during the survey.


Topside Repeater with Video Overlay

The Topside Repeater can also overlay the real-time thickness measurements on to a composite video signal, displaying it on the survey monitor screen. It will also then be recorded (if there is a video of the survey), showing exact locations and the thickness measurement for future reference.


HelmetView™ Display

This is a remote display with a fixing bracket for Kirby Morgan® Helmets that have an accessory mounting point. This is depth rated to 300 m (984 ft), and designed for use in situations with extremely poor visibility and ease of viewing by the diver.

4 reviews for Cygnus DIVE Underwater Gauge

Peter H.

Nov 08, 2015 12:55 PM

We used the 5MHz dual crystal as it gave the best results on the pitted steel we found on the many corroded ships hulls where we tried the UT gauge. The DIVE was reliable, very easy to use, has simple menu system and displays. The logging function was essential as we only had 13 minutes on the wreck each day; I could make lots of measurements and figure out the answer back home in post processing, we also didn’t have to write anything down or think too much as thinking isn’t so easy in 40m water with the effects of narcosis!

Aquilino D.

Mar 14, 2017 12:55 PM

We have used the equipment with very good results on a job so far.

Aquilino D.

Mar 28, 2017 12:54 PM

Regarding the MK-2 this has been working very good and we did over 1.000 readings with the same battery on two different days; we are completing a serial of surveys on pontoon ferries with a total of 4,000 readings and so far we are very happy with the device performance.

G Goodman

Aug 17, 2021 9:58 AM

The Cygnus DIVE was simple to use and, like all Cygnus kit, it was good and rugged.

The large display was excellent – and clearly visible even in darker water. Readings were easy to take and snapped up on the screen quickly -which makes our job as divers so much easier.

The twin crystal probes were particularly useful on areas of very heavy corrosion.

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