Cygnus DIVE Underwater Gauge

Wrist-Mountable Underwater Thickness Gauge

(4 customer reviews)

With its bright, very large display the Cygnus DIVE is simple to operate, providing accurate and reliable thickness measurements, underwater.  Depth rated to 300 metres.

Available with data logging, topside, HelmetView™ and twin crystal probe options.

MSI™ Measurement Stability Indicator – this is a feature exclusive to the Cygnus. When using the DIVE Gauge in Single-Echo and Echo-Echo modes, MSI™ confirms when a reading is stable by turning the thickness measurement numbers from red to yellow.

Cygnus Instruments builds all of its equipment in the UK using only genuine and original parts and components – including Lemo® Connectors and Peli® Cases.

Select Kit

Add on Options


Topside Repeater

Surface computer logging feature for Cygnus DIVE

Umbilical Cable (+£2.50/m)


1 metre per unit- required for Topside Repeater (TSR) Kit, Topside Repeater (TSR) Kit with Video OSD, Surface computer logging feature for Cygnus DIVE

HelmetView MK2 Remote Display Kit

Splitter Cable

Required if either Topside Repeater or CygLink Computer Display options are used in addition to HelmetView



  • 300 m depth rated
  • Wrist-mountable, giving the diver a free hand
  • A-Scan (selectable)
  • Data logging – stores 5,000 measurements and A-Scans
  • “Auto-Log” – no log button to press
  • Large bright display, easy viewing from all angles for diver and camera
  • Multiple-Echo, error- checked measurements through coatings up to 20 mm thick
  • Single-Echo – for use on uncoated surfaces with heavy back-wall corrosion/ pitting
  • MSI™ Measurement Stability Indicator – exclusive to Cygnus, confirms a stable reading in Single-Echo and Echo-Echo modes
  • Echo-Echo – for use on painted surfaces with heavy back-wall corrosion/ pitting (through up to 0.5 mm paint)
  • HelmetView™ – optional remote display.
2.8” quarter VGA colour display (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
Single 3.6V Li-ion 8.2 W battery
10 hours continuous measurement
Low battery warning ‘alert’ message
Measurement Modes
Multiple-Echo (three back-wall echoes) using Single Crystal (zero-degree) probes automatically ignores surface coatings and measures only metal thickness
Echo-Echo (two back-wall echos) using Twin Crystal probes
Single-Echo (first back-wall echo) using Twin Crystal probes
Deep Coat In Multiple-Echo mode, allows measurement to be made through thicker coatings of suitable materials of up to 20 mm thick
Accuracy ±0.1 mm or 0.1% of thickness measurement, whichever is greatest, when calibrated in accordance with Cygnus Instruments calibration procedure
Probe Cables
Double outer jacket in tough PU.  Coloured yellow for easy locations underwater.  Coiled for ease of use.  Fischer S105 series connectors.
Measurement Ranges
Multiple-Echo (through coatings) with Single Crystal probes:
2.25 MHz = 3.0 – 250 mm
3.5 MHz = 2.0 – 150 mm
5.0 MHz = 1.0 – 50 mm
Echo-Echo with Twin Crystal probes:
5.0 MHz = 4.0 – 50 mm in steel
2.0 MHz = 6.0 – 50 mm in steel
Single-Echo with Twin Crystal probes:
5.0 MHz = 2.0 – 100 mm in steel
2.0 MHz = 3.0 – 150 mm in steel
Measurement Resolution
0.1 mm – Low resolution mode or measurement >99.95 mm
0.05 mm – High resolution mode and measurement <100.0 mm
0.01 mm – Single-Echo mode only and measurement <100.0 mm
Measurement Units mm or inches
Probe Zero Fully automatic probe zeroing for all probes types
V-Path Correction Automatic V-Path correction for all Twin Crystal probes
Velocity Range 2000 –  9000 m/s in 1 m/s setps
Pulser Twin channel 70 V spike pulser
Receiver / Amplifier
10 MHz bandwidth, 120 dB range, automatic TCG
60 MHz measurement time-base
Data Logging
One-handed automatic logging of stable measurements.  Capacity for up to 5000 points including 640 point A-Scan data.
Data Output RS-485 single pair, half duplex for surface connection
Computer Software CygLink v4 allows remote logging and viewing of A-Scan graphs.  Survey and report generation to PDF file. Graphic analysis of data and statistical calculations.  Designed for Windows 7 and Windows 8.
Standards Designed for EN 15317
  • Cygnus DIVE Gauge Body and Wrist Strap
  • Ultrasonic Probe(s) with Coiled Cable
  • Two Rechargeable Batteries
  • Membrane Couplant, 25ml bottle
  • Battery Charger and Charger Base
  • AC Mains Lead for Battery Charger
  • Ultrasonic Couplant Gel (Blue), 100ml bottle
  • Test Block 15mm thick in Mil Steel
  • Spare Probe Membranes
  • Membrane Key
  • Silicone Grease, 50g tube
  • USB Flash Drive with Documentation
  • Calibration Certificate
  • Operating Manual
Single Crystal probes: 2.25 MHz 13 mm (standard) S2C
2.25 MHz 19 mm S2D
3.5 MHz 13 mm S3C
5.0 MHz 6 mm S5C
Twin Crystal probes: 2.0 MHz 13 mm x2 (for some plastics e.g. outfall pipes) T2C
5.0 MHz 8 mm x2 (standard) T5B


Allows real-time thickness measurements and calibration settings to be overlaid on the dive monitor screen. Also supplied with a hand held repeater unit.

  • Measurements superimposed on to a composite PAL or NTSC video signal
  • Overlay can be re-positioned anywhere on the screen
  • Measurements and locations recorded on the survey video.



The Cygnus DIVE can be connected to a laptop on the surface running *CygLink software. This can then be used to log readings and control gauge settings, for example the velocity of sound. Reports and graphical analysis can then be produced and saved. (*For more details, visit the CygLink Software page in PRODUCTS > THICKNESS GAUGING ACCESSORIES section).



Developed by Cygnus for divers in black or limited visibility water. The small remote OLED display is mounted just in front of the lens on the diver’s helmet. With adjustable brightness, the thickness measurement is clearly visible to the diver. When auto-log is being used, the HelmetView™ display will indicate when the reading is logged.

Options Diagram for Topside Repeater, Surface Repeater and HelmetView.



Up to 5,000 measurements and A-Scans can be stored. The “Auto-Log” feature saves each stable measurement meaning the diver doesn’t have to press a button every time a readings needs to be logged. Supplied with CygLink software.

Add a review


4 reviews for Cygnus DIVE Underwater Gauge

  1. Peter H.

    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!

  2. Aquilino D.

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

  3. Aquilino D.

    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.

  4. G Goodman

    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.

Add a review

Your email address will not be published. Required fields are marked *