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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 meters (1,000 ft) and it provides an accurate metal thickness measurement through coatings up to 20 mm (0.787 in) thick using Deep Coat mode (upon request). The bright LED display ensures easy viewing even in poor visibility conditions.

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

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

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  • RINA approved (Certificate No. 2009DGPO787)
  • Auto Probe Recognition (APR)
  • Deep-Coat mode for measuring through coatings up to 20 mm (0.787 in) thick (upon request)
  • 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 (1,000 ft) 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 – 7000 m/s (0.059 – 0.31 in/microsec) – covers virtually all common engineering materials
Measurement Range in Steel 3 – 250 mm (0.110 – 9.995 in) with 2.25 MHz probe
2  – 150 mm (0.065 – 6.000 in) with 3.5 MHz probe
1 – 50 mm (0.045 – 4.000 in) with 5.0 MHz probe
Accuracy 0.1 mm (0.005 in) when calibrated in accordance with Cygnus Instruments calibration procedures
Resolution 0.1 mm (0.005 in) or 0.05 mm (0.002 in) (selectable)
Power NiMH rechargeable battery pack
Battery Life 30 hours (continuously measuring)
Display Large, bright LED display
Size 235 x 75 mm (8 3/8 x 3 in)
Weight 950 g (2.1 lbs) – with probe
860 g (30.3 oz) – with fixed head probe
Operating Temp -10°C to +50°C (14°F to 122°F)
Environmental Protection IPX8 continuous 300 m (984 ft) rating
Standards Designed for EN 15317
Environmental RoHS, WEEE compliant


For orders under € 450 we charge € 25 order costs.
Prices shown on this website are before taxes, currency changes and shipping costs.
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