Cygnus 4 General Purpose

Multiple-Echo Ultrasonic Thickness Gage

(5 customer reviews)

The Cygnus 4 ultrasonic thickness gauge is small, tough and accurate.

Designed for the harshest of environments with a simple to use keypad and intuitive menus and a colour LCD display which can be viewed in all lighting conditions.

The twin shot injection moulded enclosure has a soft but durable TPE outer skin which is both comfortable and robust while the inner shell is strong, keeping the electronics totally sealed from the outside world. Having passed the stringent US Military Standard 810G environmental tests, this new housing represents toughness and reliability.

The Cygnus Multiple-Echo, single crystal probe, technology means you can measure through thick coatings and only the remaining metal thickness is displayed.

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





  • Multiple-Echo for reliable, accurate through coating measurements
  • Large bright colour LCD screen with automatic LCD back light
  • Min / max measurement limit functions with visual and vibrate alert
  • Extremely rugged enclosure – shock and impact to MIL STD 810G
  • Environment sealing to IP67 – MIL STD 810G
  • Deep-coat mode – measures through coatings up to 20 mm thick
  • Cygnus echo-strength bars assist thickness measurements
  • TPE over molded enclosure
  • Buttons designed for minimum of 100,000 depressions
  • Fully sealed battery compartment (contains any leaking battery fluids).


Multiple-Echo Ignores Coatings up to 20mm Thick


Cygnus Thickness Gauge Impact Test


Cygnus Thickness Gauge Water Resistance Dunk Test


Cygnus Thickness Gauge Water Resistance Hose Test


Large Bright LCD Display

Materials Sound velocities between 1000 – 9000 m/s – covers virtually all common engineering materials
Accuracy ±0.1 mm or 0.1% of thickness measurement, whichever is greatest, when calibrated in accordance with Cygnus Instruments calibration procedure
Resolution 0.1 mm or 0.05 mm
Measurement Range in Steel 3 – 250 mm with 2.25 MHz probe (S2C/D)
2 – 150 mm with 3.5 MHz probe (S3C)
1 – 50 mm with 5.0 MHz probe (S5C/A)
Connector 1 x Lemo 1
Power 3 x AA batteries
Battery Life 10 hours minimum, continuously measuring
Electronics Dual channel pulser
Display 2.4″ quarter VGA LCD
Size 132 x 82 x 34 mm
Weight 300 grams (inc. batteries)
Operating Temperature -10°C to 50°C
Environmental Rating IP67 (dust tight and immersion – 1 metre for 30 mins)
MIL STD 810G Method 501.6 (high temp +55°C)
MIL STD 810G Method 502.6 (low temp -20°C)
MIL STD 810G Method 507.6 (humidity 95%)
MIL STD 810G Method 512.6 (immersion – 1 metre for 30 mins)
Shock and Impact MIL STD 810G Method 514.7 (vibration – 1 hour each axis)
MIL STD 810G Method 516.7 (shock 20g – 11ms half sine shock pulse, 40g 11ms in each axis)
MIL STD 810G Method 516.7 (26 drops – transit drop 1.22 m)
Standards Designed for EN 15317
Environmental RoHS, WEEE compliant
Warranty 3 years on gauge and 6 months on probe


  • Cygnus 4 Gauge
  • Operating Manual
  • Neck Strap
  • Ultrasonic Probe
  • Moulded Probe Cable
  • Accessory Pouch, containing: 3 x AA Batteries; Blue Couplant Gel; 15mm Steel Test Block; Spare Membranes; Membrane Key; Membrane Couplant.
Single Crystal Probes: 6 mm – 5.0 MHz (S5A)
13 mm – 2.25 MHz (S2C (standard)), 3.5 MHz (S3C) or 5.0 MHz (S5C)
19 mm – 2.25 MHz (S2D)


5 reviews for Cygnus 4 General Purpose

  1. Lester


  2. Hashem B.

    Reliable, accurate and easy to operate

  3. Nick V.

    Very good and very pleased

  4. Nick V.

    I am very pleased with our Cygnus 4 ultrasonic thickness gauge. It works very well, it’s reliable, easy to use and feels like a good quality piece of kit that is well worth the price.

  5. Jagdeep S.

    Thank you Cygnus. You have been awesome in your support on ALL our inspections for over 20 years. 60 machines including our first machine bought 20 years ago (Cygnus 4, Sr. No 300), are all still in operation. That is a testament to Cygnus’ quality engineering and electronics.

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Flexible Handling

Along with the wrist and neck straps supplied in the kit there is also an optional belt clip, offering a range of flexible handling solutions for all types of applications.