Cygnus Underwater

Cygnus Underwater

The Cygnus Underwater is the original diver held subsea multiple echo Ultrasonic Thickness Gauge. It was designed for use by divers undertaking subsea maintenance and surveys 3 decades ago… and today it is still the industry standard.

The unit is depth rated to 300 metres and it provides an accurate metal thickness measurement through coatings up to 20mm thick. The bright LED display ensures easy viewing even in poor visibility conditions.

The Underwater Thickness Gauge is supplied ready to use as a complete kit with 2 rechargeable batteries in a protective carry case.

More about this product


  • RINA approved (Certificate No. 2009DGPO787)
  • Auto – Probe Recognition (APR)
  • “Deep-Coat” mode for measuring through coatings up to 20 mm thick
  • Easy calibration using convenient buttons
  • Rugged, durable, shock-proof construction
  • Stable calibration – linear accuracy – no zero adjustment
  • Large bright LED display for poor visibility
  • Pressure rated to 300 m depth
  • Heavy duty sealed unit with double ‘O’ ring protection
  • Self verification of measurements to ensure accuracy
  • Echo strength indicator to aid measurement
  • All probes are protected by a membrane to prevent damage
  • Various probe options
  • Two rechargeable battery packs with charger
  • Fixed head probe option for single handed use.


Materials Sound velocities between 2000 m/s and 7000 m/s – covers virtually all common engineering materials
Measurement Range in Steel 3 mm – 250 mm with 2.25 MHz probe
2 mm – 150 mm with 3.5 MHz probe
1 mm – 50 mm with 5 MHz probe
Accuracy 0.1 mm when calibrated in accordance with Cygnus Instruments calibration procedures
Resolution 0.1 mm or 0.05 mm (selectable)
Probes Single crystal soft-faced compression
6 mm – 5 MHz
13 mm – 2.25, 3.5 or 5 MHz
19 mm – 2.25 MHz
Power NiMH rechargeable battery pack
Battery Life 30 hours (continuously measuring)
Display Large, bright LED display
Size 235 mm x 75 mm
Weight 950 g – with probe
860 g – with fixed head probe
Operating Temp -10°C to +50°C
Environmental Protection IPX8 continuous 300 m rating
Compliance CE, British Standard BS EN 15317:2013
Environmental RoHS, WEEE compliant

Product gallery

Related digital products

View all products available


Go to Top