Ultrasonic Thickness Gauges

What Is an Ultrasonic Thickness Gauge?

An ultrasonic thickness gauge is a handheld non-destructive testing (NDT) instrument that measures the wall thickness of a material from only one side — no cutting, drilling, or disassembly required. It works by sending a high-frequency ultrasonic pulse into the material through a probe, then timing how long that pulse takes to bounce back from the opposite surface. Using the known speed of sound through that material, the gauge instantly calculates and displays the thickness in millimeters or inches.

This is the same principle behind medical ultrasound — but tuned for industrial inspection. A modern digital ultrasonic thickness gauge like the Cygnus 6+ PRO can measure with accuracy down to ±0.1 mm, log thousands of readings, and display a live A-scan waveform so inspectors can verify every measurement on the spot.

How Do Ultrasonic Thickness Gauges Work?

Every Cygnus UT thickness gauge uses one of two ultrasonic techniques:

Multiple-Echo Mode — The probe sends a sound pulse that reflects back-and-forth between the front and back walls of the test piece. The gauge measures the time between successive echoes, automatically ignoring any paint or coating thickness. This is why Cygnus gauges are famous for measuring through paint and coatings without grinding the surface clean.

Single-Echo (Pulse-Echo) Mode — Used for very thin materials or where multiple echoes aren’t possible. The gauge times one round-trip pulse and applies a calibration to deliver a precise reading.

The result: fast, accurate, repeatable corrosion monitoring whether you’re checking a ship hull, an oil and gas pipeline, a pressure vessel, or a storage tank.

Our Range of Ultrasonic Thickness Testers

Cygnus manufactures one of the most complete lines of professional ultrasonic thickness testers in the industry. Every gauge is built in the UK to ISO 9001 standards and ships with full US technical support from our Houston-based team. Browse the models below to find the right tool for your application:

Cygnus 1 Ex — Intrinsically Safe Ultrasonic Thickness Gauge

The Cygnus 1 Ex is the world’s leading intrinsically safe ultrasonic thickness gauge, fully certified for use in ATEX, IECEx, and US Class I Division 1 hazardous environments — including refineries, offshore platforms, coal mines, and combustible gas zones (0, 1, and 2). Its single-button operation lets inspectors take confident readings while wearing gloves in extreme conditions.

Cygnus 2+ Hands Free — Wearable UT Gauge

The Cygnus 2+ is the only hands-free ultrasonic thickness gauge on the market. With its end-mounted display worn on the wrist or forearm, it’s ideal for rope access technicians, confined-space inspections, and anywhere you need both hands free for safety or maneuvering.

Cygnus 4 General Purpose — Affordable UT Tester

A rugged, easy-to-use handheld ultrasonic thickness gauge for everyday inspection work. The Cygnus 4 features an intuitive menu, the proven Multiple-Echo technique for through-coating measurement, and a battery that lasts a full shift.

Cygnus 4+ General Purpose — UT Gauge with Data Logging

Steps up with a live A-scan display, sequential data logging for up to 5,000 readings, USB data transfer, and Bluetooth connectivity — all in a tough handheld housing built for plant maintenance and shipyard inspection.

Cygnus 6+ PRO — Professional Ultrasonic Thickness Gauge

The flagship Cygnus 6+ PRO is the best ultrasonic thickness gauge for demanding professional users. Full A-scan and B-scan imaging, advanced gating, customizable data templates, and onboard report generation make it ideal for asset integrity managers, certified NDT Level II/III inspectors, and corrosion engineers.

Cygnus Underwater & Cygnus DIVE — Diver-Held Underwater UT Gauges

Purpose-built underwater ultrasonic thickness gauges for commercial divers inspecting ship hulls, jetties, harbor pilings, pipelines, and offshore structures. The new Cygnus Underwater and the legendary Cygnus DIVE both feature large clear displays, free-hand operation, and depth ratings for serious commercial diving work.

Cygnus ROV UTM, ROV Mountable & Mini ROV — Subsea Gauges

For deep-water inspection on ROVs, Cygnus offers three subsea-rated ultrasonic wall thickness gauges. The Mini ROV mounts on observation-class vehicles, the ROV Mountable fits work-class ROVs, and the ROV UTM is depth-rated to nearly 10,000 feet (3,000 m) — built for offshore oil and gas asset integrity programs.

Industries That Rely on Cygnus Ultrasonic Thickness Meters

Across the United States, professionals choose Cygnus ultrasonic thickness meters for mission-critical inspection work:

• Oil & Gas — Pipeline wall thickness checks, refinery vessel inspection, storage tank corrosion monitoring
• Marine & Shipping — Hull plating surveys, ballast tank inspection, hatch cover testing
• Offshore & Subsea — Platform leg inspection, riser monitoring, ROV-based subsea integrity work
• Power Generation — Boiler tubes, heat exchangers, scrubber corrosion measurement
• Civil & Infrastructure — Bridge structural inspection, water tower monitoring, road tanker certification
• Plant Maintenance — Pressure vessels, piping, condensers, and process equipment
• Rope Access — Wind tower inspection, stack and chimney NDT surveys

If your asset is made of metal and exposed to corrosion or erosion, a Cygnus NDT thickness gauge belongs in your toolkit.

Why Choose the Best Ultrasonic Thickness Gauge for the Job

When you invest in Cygnus, you get more than a meter — you get four decades of NDT engineering experience built into every unit:

• Patented Multiple-Echo technology — Reads accurately through paint and coatings up to 0.25 inches thick
• Built in the UK to ISO 9001:2015 quality standards
• US-based support — Houston office, factory-trained technicians, fast turnaround
• Calibration & repair through our certified service centers
• 2-year warranty on all new Cygnus ultrasonic thickness gauges
• Trusted by the US Navy, USCG, ABS, DNV, and Lloyd’s-approved surveyors

Ready to Order Your Cygnus Ultrasonic Thickness Gauge?

Browse the full range above or contact our US team for a quote, demo, or technical consultation. We ship throughout the United States, Canada, and Mexico from our Houston office, with full calibration, training, and after-sales support included.