Ultrasonic Digital Thickness Gauge, Heavy Duty, Model 1 by Cygnus

Heavy duty metal wall digital thickness gauge for use indoors or outdoors. Measures remaining metal thickness without removing surface coatings.

Cygnus Instruments have designed the Cygnus Heavy Duty ultrasonic thickness gage for use in tough and demanding environments where a rugged construction is essential to accurately gage corrosion measurement and determine metal thickness without having to removing protective coatings.

The Cygnus Heavy Duty is dirt resistant, dust resistant and water resistant. Its shock-proof construction takes into account the unstable environments in which corrosion thickness measurements and structural inspections are performed, resulting in a metal thickness gage that is able to withstand accidental drops, bangs and knocks.  


  • Heavy duty sealed unit - highly water and dust resistant
  • Rugged construction - shock proof
  • Stable calibration - linear accuracy - no zero adjustment
  • Self verification of the measurements to ensure accuracy
  • Various probe options
  • Displays sound velocity settings
  • Echo strength indicator to aid measurement
  • Bright LED display with polarised filter
  • Gauge senses probe type and automatically adjusts settings for optimum performance
  • Low battery warning
  • Metric / Imperial switchable
  • Deep-Coat mode for coatings up to 20 mm (3/4") thick. 


For optimum performance of the ultrasonic thickness gauge it is essential to utilise the appropriate probe for the specific material being tested. Here below are the probe options available.

Single crystal soft-faced compression
6 mm - 5 MHz
13 mm - 2.25, 3.5 or 5 MHz
19 mm - 2.25 MHz


Instrument, heavy duty remote 2.25 MHz x 13 mm (1/2") diameter probe, battery pack, spare membranes and ‘O’ rings, steel test block, calibration trim tool, operational manual and carry case.


tenance and safety checks of metal thickness for:

  • Metal thickness monitoring on cranes, marine structures and conveying systems
  • Corrosion checks on ships’ shell plates, bulkheads and structure
  • Metal thickness safety checks on steam and pressurised water systems, transportable gas containers and compressed air systems 
  • Systematic wall thickness and corrosion monitoring of storage tanks and process vessels 
  • Quality assurance metal thickness checks 
  • Maintenance and safety checks on bridges and street lighting columns 
  • Pipeline wall thickness monitoring.

With multiple echo, readings are taken by measuring the time delay between any three consecutive backwall echos. The time of T1 (coating thickness) is ignored. The times of T2 and T3 are equal to the time that it takes to travel through the metal. Only by looking at three echoes can the measurements be automatically verified (where T2 = T3).


  • Measures remaining metal thickness on corroded and coated structures
  • All measurements are error checked using 3 return echoes to give repeatable, reliable results
  • Accepted by all major classification societies
  • Greatly reduces inspection time and costs
  • Echo strength indicator to aid measurement.




Sound velocities between 2000 m/s and 7000 m/s


3 mm to 250 mm with 2.25 MHz probe
2 mm to 150 mm with 3.5 MHz probe
1 mm to 50 mm with 5 MHz probe


± 0.1 mm or ± 0.05 mm


0.1 mm or 0.05 mm


Remote single-crystal, soft-faced compression.
6 mm - 5 MHz
13 mm - 2.25 MHz, 3.5 MHz or 5 MHz
19 mm - 2.25 MHz

Power Source

3 x AA alkaline batteries


Large, clear LED display with polarized filter


240 mm x 75 mm


886 g - remote probe
827 g - fixed head

Operating Temperature

-10°C to +50°C


3 years