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Cygnus 4, General Purpose Ultrasonic Thickness Gauge

The Cygnus General Purpose is a compact, light-weight, general purpose digital thickness gauge from Cygnus Instruments.

This hand-held NDT ultrasonic thickness gauge measures metal thickness and corrosion levels providing accurate, error-checked measurements through coatings. Highly versatile it can be employed in most hand-held industrial or shipping inspection applications.

The LCD display is easily visible outdoors and its automatic white back light control makes it ideal for use in all light conditions. Menu-driven operation and "Deep-Coat" mode allow easy thickness gauging through coatings up to 20 mm.

Cygnus 4, supplied in an IP65 & IP67 rated/sealed aluminium enclosure, protective silicon sleeve and optional belt/harness clip is extremely light, tough and simple to use.

  • Light, rugged, small and shock-proof within IP65 & IP67 sealed aluminium enclosure
  • Gauge senses probe type and automatically adjusts settings for optimum performance
  • Valid thickness measurements and minimum thickness function
  • LCD Graphic Display with automatic white back light
  • Cygnus Echo-Strength bars assist thickness measurements
  • Simple gauge and menu operation with 3 tactile keys
  • Protective silicone sleeve offers maximum protection and versatility
  • Secure, Twist-to-lock probe connection (BNC)
  • Deep-coat mode for coatings up to 20 mm thick
  • Display Freeze function for easy measurement verification and logging.
Cygnus 4
Ultrasonic Thickness Gauge - Cygnus 4

Benefits of Cygnus Multiple Echo
  • 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.


Materials Sound velocities between 2000 and 7000 m/s (0.059 and 0.31 in/microsec) - covers virtually all common engineering materials
Measurement range in steel 3 mm - 250 mm (0.110" - 9.995") with 2.25 MHz probe
2 mm - 150 mm (0.065" - 6.000") with 3.5 MHz probe
1 mm - 50 mm (0.045" - 4.000") with 5.0 MHz probe
Accuracy 0.1 mm (0.005") when calibrated in accordance with Cygnus Instruments Calibration Procedures
Resolution 0.1 mm or 0.05 mm
(0.005" or 0.002") (selectable)
Probes Single crystal soft-faced compression
6 mm (1/4") - 5 MHz
13 mm (1/2") - 2.25, 3.5 or 5 MHz
19 mm (3/4") - 2.25 MHz
(Lower frequency probes offer better penetration on heavy corrosion/coatings)
Protection IP65 & IP67
Warranty 3 years on Gauge, 6 months on probes

Kit Contents
Instrument, 2.25MHz x 13 mm (1/2") diameter probe, spare membranes, steel test block, membrane couplant, ultrasonic couplant, accessory pouch, protective silicone sleeve with neck strap, operation manual, carry case, blue high flex probe cable and optional belt/harness clip

Cygnus 4 Pipe Thickness Tester
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