Cygnus 4 General Purpose

Ultrasonic Thickness Meter

This robust thickness meter is truly simple to use. It has an intuitive menu and, thanks to the Multiple-Echo technique, it accurately measures metal thickness without removing protective coatings.

Key Features of the Cygnus 4 General Purpose Meter

  • Multiple-Echo mode for accurate, through-coat measurements as specified by Classification Societies
  • Deep Coat function ignores coatings up to 0.8 inch (20 mm) thick
  • Simple, one-point calibration – no zeroing required
  • Min/Max measurement limit functions
  • Visual and vibrate alert
  • Intuitive easy to use menu
  • Large and bright front color 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.

Cygnus-Pioneered Multiple Echo Technique

  • Uses three return echoes to give a truly accurate, error-checked metal thickness measurement – ignoring coatings up to 0.8 inch (20 mm).
  • Accepted by all the major Classification Societies.

Multiple-Echo Ignores Coatings up to 0.8 inch (20 mm) Thick

Cygnus Thickness Meter Impact Test

Cygnus Thickness Meter Water Resistance Dunk Test

Cygnus Thickness Meter Water Resistance Hose Test

Large Bright LCD Display

MaterialsVelocities from 0.0390 – 0.3543 in/us (1,000 – 9,000 m/s)
Accuracy±0.002 inch (±0.05 mm) – in Multiple-Echo measurement mode, when calibrated and measuring the same material as calibrated on
Resolution0.005 inch (0.1 mm) or 0.002 inch (0.05 mm)
Transducer OptionsSingle crystal transducers
Measurement Range in Steel0.040 – 10 inch (1 – 250 mm) depending on selected transducer 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
Size3.3 x 5.1 x 1.4 inch (84 x 130 x 35 mm)
Weight10.5 oz (300 g) (inc. batteries)
Operating Temp.14°F – 122°F (-10°C to 50°C)
Environmental RatingIP67
MIL STD 810G Method 501.6 (high temp 131°F (+55°C))
MIL STD 810G Method 502.6 (low temp -4°F (-20°C))
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 gage and 6 months on transducer


  • Cygnus 4 gage
  • Operating manual
  • Neck strap
  • Ultrasonic transducer
  • Moulded transducer cable
  • Accessory pouch, containing; 3 x AA batteries, blue couplant gel, 15 mm (or ½ inch) steel test block, spare membranes, membrane key, membrane couplant.
Weight5 kg

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

To compliment our ultrasonic thickness gages we offer a range of ultrasonic transducers. The performance of any ultrasonic thickness gage relies heavily on the transducer and its suitability to the material being measured. Therefore, selecting the right transducer is vital. All Cygnus SINGLE CRYSTAL transducers 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


Aug 21, 2016 9:46 AM


Hashem B.

May 11, 2017 9:46 AM

Reliable, accurate and easy to operate

Nick V.

Jan 26, 2018 9:47 AM

Very good and very pleased

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.

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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