Cygnus Instruments

Cygnus 4 General Purpose thickness gauge

The NEW 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.

Winner of the Red Dot Award: Product Design 2015 (Click for more details)

Cygnus 4 General Purpose Brochure  Enquire about the Cygnus 4 General Purpose

Cygnus 4 General Purpose
  • Cygnus 4 General Purpose
  • **This image shows an example of kit contents. Probes and belt clip are optional, subject to choice.**


Cygnus Probes and Cables

Cygnus Stainless Steel INOX Probes

The INOX probes have an updated ergonomic design and an easy to read frequency and serial number identification.  All frequencies of INOX probes have a black face and a colour coding ring to identify probe frequency.

Cygnus Cables

Using standard industry connectors the probe lead uses a custom made over moulded cable that offers superior flexibility and resistance to oils and ultraviolet light. The cable will not stiffen after exposure to ultraviolet light.

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.



  • 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, measure through coating up to 20 mm thick
  • Cygnus echo-strength bars assist thickness measurements
  • TPE over moulded enclosure
  • Buttons designed for minimum of 100,000 depressions
  • Fully sealed battery compartment (contains any leaking battery fluids).

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Materials Sound velocities between 2000 m/s - 9000 m/s (0.079 in/ms - 0.35 in/ms) - covers virtually all common engineering materials
Accuracy ±0.1 mm (±0.004”) 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 (0.005" or 0.002")
Probes Single crystal probes:
  • 6 mm (¼”) - 5.0 MHz (S5A)
  • 13 mm (½”) - 2.25 MHz (S2C (standard)), 3.5 MHz (S3C) or 5.0 MHz (S5C)
  • 19 mm (¾”) - 2.25 MHz (S2D)
Measurement Range in Steel Single crystal probes:
  • 3 mm - 250 mm (0.120" - 10.00") with 2.25 MHz probe (S2C/D)
  • 2 mm - 150 mm (0.080" - 6.000") with 3.5 MHz probe (S3C)
  • 1 mm - 50 mm (0.040" - 2.000") 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 mm x 82 mm x 34 mm (5.20" x 3.23" x 1.34")
Weight 300 grams (10.58 oz) inc. batteries
Operating Temp. -10°C to 50°C (14°F to 122°F)
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)
Compliance CE, British Standard BS EN 15317:2013
Environmental RoHS, WEEE compliant
Warranty 3 years on gauge and 6 months on probe

Kit Content

Cygnus ultrasonic thickness gauge; padded carry case; operating manual; adjustable neck strap and loops; wrist strap; accessory pouch; spare membranes; surface and membrane couplant; test block; 3 x AA batteries; optional Krusell® belt clip and attachments accessory.

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