Cygnus 6+ PRO

Ultrasonic Thickness Tester

Designed for professional users working within inspection, repair and maintenance, this is Cygnus' most advanced thickness measurement instrument. Boasting a full range of useful features, including: high temperature probe for thickness readings on surfaces at temperatures up to 300°C; comprehensive data logging; live A-scan and real-time B-scan displays; plus much more.

Key features of the Cygnus 6+ PRO ultrasonic thickness tester include:

  • Multiple-Echo for accurate through-coat measurements, as specified by Classification Societies
  • Echo-Echo and Single-Echo modes for heavily corroded metals with a thin or no coating
  • Temperature Compensation feature for measurement on hot materials
  • Deep Coat function ignores coatings up to 20 mm thick
  • MSI™ helps verify stable and reliable measurements
  • Manual and automatic gain control
  • Min/max measurement limit functions with visual and vibrate alert
  • Uses single and twin crystal probes
  • Freeze function
  • One and two point calibration
  • Bluetooth™ for data transfer
  • Large front LCD display and end-mounted rotatable
  • LCD display with grayscale setting for bright sunlight
  • Safe operation in explosive atmospheres: Class 1, Division 2, Group D locations only, as defined in NFPA 70, Article 500
  • Water and dust tight IP67 housing
  • Shock and impact proof to US MIL STD 810G.

High Temperature Measurement

  • Using the NEW High Temperature Probe, measurements can be taken on hot surfaces of up to 300°C
  • No cooling period required, reducing inspection time and facilitating more effective measurement
  • Option to use standard cable or more robust, braided cable.

Comprehensive Data Logging

  • Linear, 2D grid and template based logging
  • 16 grid patterns available
  • Add radial points to any measurement to further investigate immediately an area of interest or heavy corrosion
  • Eight user-defined text comments to attach to any measurement point
  • Auto-log feature
  • Saves measurements and A-scans
  • Records stored on an SD card
  • CygLink software used to transfer and manage data.

Three Versatile Measuring Modes

  • Multiple-Echo mode uses three error checked back wall echoes to provide the most reliable and accurate remaining thickness measurements, with no need to remove coatings (up to 20 mm thick)
  • Single-Echo mode is ideal for measuring uncoated metals with heavy front and/or back-wall corrosion. Also effective on a range of cast metals, plastics and composites
  • Echo-Echo mode works best for measuring heavily corroded metals through thin coatings of up to 1 mm thick, ideal for measuring painted metals with heavy back wall corrosion.

CygLink Software

CygLink is a Windows® based application used to transfer and manage data logger records, A-scans, measurement comments and material velocity tables. The program can generate PDF reports and export to Excel. It also displays A‑scans, allowing for after-the-event analysis of logged measurements.

MSI™ (Measurement Stability Indicator)

Exclusive to Cygnus, MSI™ ensures stable and therefore, reliable measurements are displayed in Echo‑Echo and Single-Echo modes.

Multiple-Echo Mode Ignoring Coatings up to 20 mm Thick

Measuring Heavily Corroded Metals

Echo-Echo Mode Ignoring Coatings up to 1 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

Cygnus 6+ PRO Ultrasonic Thickness Tester Featuring Dual Display

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

Large LCD Display and Simple Menu Operation on Cygnus Ultrasonic Thickness Testers

Measuring Uncoated Small Diameter Pipes

Measuring Small Diameter Pipes Through Coatings

A-Scan on Corrosion


Measuring ModesMultiple-Echo using 3 echoes to ignore coatings up to 20 mm thick
Echo-Echo using 2 echoes to ignore coatings up to 1 mm thick
Single-Echo using 1 echo
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
±0.1 mm or 0.1% of thickness measurement whichever is the greatest – in Single-Echo & Echo-Echo measurement modes, when calibrated and measuring the same material as calibrated on
ResolutionMultiple-Echo mode – 0.1 mm or 0.05 mm
Single-Echo and Echo-Echo modes – 0.1 mm or 0.01 mm
Probe optionsSingle Crystal Probes
Twin Crystal Probes
High Temperature Probe
Measurement Range in Steel0.8 – 250 mm depending on selected probe and configuration, material and temperature
Connector2 x Lemo 00
Power3 x AA / R6 batteries
Battery LifeApprox. 10 hours continuous measurement
ElectronicsDual channel pulser
DisplayFront LCD 2.4 inch QVGA: 47 x 37 mm
End-mounted LCD: 25.58 x 6.38 mm
Size84 x 130 x 35 mm
Weight300 g (inc. Batteries)
Operating Temp.-10°C to 50°C
Data Logging5,000 measurements and A-scans per record
Max number records: 100 (soft limit)
Computer SoftwareCygLink allows remote logging and viewing of A-scan graphs
Survey and report generation to PDF file
Graphic analysis of data and statistical calculations
Environmental RatingIP67
Safe operation in Explosive Atmospheres: Class I, Division 2, Group D Locations only, as defined in the National Fire Protection Association Code (NFPA 70), Article 500. Tested using MIL-STD-810G, Method 511.5, Procedure I
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


Basic kit for the Cygnus 6+ PRO ultrasonic thickness tester includes:

Instrument body fitted with a hand strap, operating manual, neck strap, accessory pouch that contains 3 x AA batteries and blue couplant gel, USB memory stick with CygLink installer and USB lead

Single element probe kit for the Cygnus 6+ PRO ultrasonic thickness tester includes items listed in basic kit, plus:

Ultrasonic probe, moulded probe cable, 15 mm steel test block, spare membranes, membrane key and membrane couplant.

Twin element probe kit for the Cygnus 6+ PRO ultrasonic thickness tester includes items listed in basic kit, plus:

Ultrasonic probe and moulded probe cable.

Weight5 kg

Cygnus 6+ PRO Standard Kit WITHOUT PROBE (050-6500/5), Cygnus 6+ PRO High Temperture Kit with Probe T5B-MAUH 5MHz Twin Element & Twin Lemo 00 to Microdot Lead (050-6502/5)

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 Cygnus’ portable UTM probes are made from stainless steel and have a hard wear face or a wear membrane to protect the probe.

Variety of Cygnus INOX Probes

  • Stainless steel Single Crystal probes: Used in multiple-echo mode, include replaceable membranes for long life, require no zeroing and have a high linear accuracy.
  • Stainless steel Twin Crystal probes: Used in echo-echo and single-echo modes, have improved measurability on extreme back wall corrosion and pitting.
  • Probes for use with the Cygnus 2+, 4, 4+ and 6+ testers are fitted with a BNC or Lemo 00 connector.

Single Crystal Probes


Twin Crystal Probes

High Temperature Probe

Twin element ultrasonic probe designed for high-temperature, in-service thickness measurements and corrosion surveys across oil and gas, refining, energy and process sectors.

  • No cooling period required – reducing inspection time and facilitating effective measurement
  • For use on hot surfaces up to 300°C
  • Measures remaining wall thickness from 1.5 to 250 mm, depending on temperature and material.

5 reviews for Cygnus 6+ PRO

Avatar Of Stewart D.

Stewart D.

Jul 18, 2016 11:05 AM

I would like to express our appreciation regarding Cygnus’ support during a recent umbilical manufacturing verification project. Your customer service was exemplary and we are impressed by the legibility of the readout on the Mk5 gauge. On appraising Cygnus of the background to our requirement, the equipment was despatched and received the next day. Its ease of use means that we will certainly call upon you for any further such requirements. Thanks for your assistance.

Avatar Of Ricky T.

Ricky T.

Mar 27, 2017 11:04 AM

Getting to grips with it, it’s had a little use I think it’s showing about 20hrs on the opening screen. I like the new style and display also like the wrist mount. Not used the data logging yet but I am sure I will. A pleasure to do business with you and I am sure I will be back again in the future.

Avatar Of Agboola O.

Agboola O.

Apr 24, 2017 11:07 AM

first time I believed is going to perform well

Avatar Of Blagoja S.

Blagoja S.

Oct 01, 2019 11:03 AM

We have purchase 4 pcs. of Cygnus 4+ UTG Kit and 1 pcs. of Cygnus 6+ UTG Kit. With these instruments we have check more that 3.000.000 points on coated steel pipe. Results were among expected. We are more than satisfied with equipment.

Avatar Of Mr Hernandez

Mr Hernandez

May 06, 2020 11:06 AM

We tried the gauge on steel components of civil structures and it gives really accurate readings.

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Cygnus 6+ PRO Brochure

Cygnus Surface Gauge Family Brochure

Cygnus Surface Range Comparison Guide

Cygnus 6+ PRO – Consumables Reorder Form

Simple Menu Operation

Radial Points

Auto-Logging Measurements

How to Add Data Logging Comments

How to Set Limit Alerts

How to Review and Save B-Scans