Cygnus 4 General Purpose

Ultrasonic Thickness Tester

A tough and truly simple to use ultrasonic thickness tester with an intuitive menu.  This metal thickness tester is designed for accurately measuring metal thickness through paint, thanks to the Multiple-Echo technique, so there is no need to remove protective coatings.

Key features of the Cygnus 4 General Purpose ultrasonic thickness tester include:

  • Multiple-Echo for accurate through-coat measurements, as specified by Classification Societies
  • Deep Coat function ignores coatings up to 20 mm thick
  • Min/Max measurement limit functions
  • Visual and vibrate alert
  • Simple, one-point calibration – no zeroing required
  • Intuitive easy to use menu
  • Large and bright front colour LCD display
  • Extremely rugged enclosure – shock and impact proof to US MIL STD 810G
  • Environmental sealing (water and dust proof) to IP67 – US MIL STD 810G
  • Can be upgraded to 4+ or 6+ at an additional cost.

Key benefits of the Cygnus pioneered Multiple-Echo technique include:

  • 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.

Multiple-Echo Mode Ignoring Coatings up to 20 mm Thick

Impact Test of a Cygnus Ultrasonic Thickness Tester

Water Resistance Dunk Test of a Cygnus Ultrasonic Thickness Tester

Water Resistance Hose Test of a Cygnus Ultrasonic Thickness Tester

Large Bright LCD Display on Cygnus 4, 4+ and 6+ Ultrasonic Thickness Testers

MaterialsVelocities from 1,000 – 9,000 m/s
Accuracy±0.05 mm in Multiple-Echo measurement mode, when calibrated and measuring the same material as calibrated on
Resolution0.1 mm or 0.05 mm
Probe OptionsSingle crystal probes
Measurement Range in Steel1 – 250 mm depending on selected probe and configuration, material and temperature
Connector2 x Lemo 00
Power3 x AA / R6 batteries
Battery Life10 hours continuous measurement
ElectronicsDual channel pulser
Display2.4 inch QVGA LCD, 47 X 37 mm
Size84 x 130 x 35 mm
Weight300 g (inc. batteries)
Operating Temp.-10°C to 50°C
Environmental RatingIP67
MIL STD 810G Method 501.6 (high temp +55°C (131°F))
MIL STD 810G Method 502.6 (low temp -20°C (-4°F))
MIL STD 810G Method 507.6 (humidity 95%)
MIL STD 810G Method 512.6 (immersion 1 metre for 30 mins)
Shock and ImpactMIL STD 810G Method 514.7 (vibration)
MIL STD 810G Method 516.7 (shock 20g)
MIL STD 810G Method 516.7 (transit drop 1.22 m)
StandardsDesigned for EN 15317
ComplianceCE, UKCA, RoHS
Warranty3 years on tester
6 months on probe


Instrument body, operating manual, neck strap, ultrasonic probe, moulded probe cable and accessory pouch containing; 3 x AA batteries, blue couplant gel, 15 mm steel test block, spare membranes, membrane key and membrane couplant.

Weight5 kg

Cygnus 4 General Purpose Standard Kit WITHOUT PROBE (050-4000/5)

To compliment Cygnus’ range of ultrasonic thickness testers we offer a range of portable UTM probes. The performance of any ultrasonic thickness tester relies heavily on the probe and its suitability to the material being tested. Therefore, selecting the right probe is vital.

All of Cygnus’ Single Crystal portable UTM probes are made from stainless steel and include replaceable membranes for long life, requiring no zeroing and have a high linear accuracy.

5 reviews for Cygnus 4 General Purpose

Avatar Of Lester


Aug 21, 2016 9:46 AM


Avatar Of Hashem B.

Hashem B.

May 11, 2017 9:47 AM

Reliable, accurate and easy to operate

Avatar Of Nick V.

Nick V.

Jan 26, 2018 9:47 AM

Very good and very pleased

Avatar Of Nick V.

Nick V.

Apr 04, 2018 9:48 AM

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.

Avatar Of Jagdeep S.

Jagdeep S.

Apr 23, 2020 9:48 AM

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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