Product Catalogue/Brochure

UMX-2 Ultrasonic Thickness Gauge

The UMX-2 Underwater gauge is the latest addition to Qualitest product range. Fully equipped with DSP platform using FPGA technology, it's extremely versatile for all those offshore inspections. The enclosure is extremely durable, with a maximum depth rating of 1000ft (300m), and offers the use of both Dual & Single Membrane transducers to accommodate as per application requirements. The features include: auto probe zero, auto probe recognition, and multiple measurement mode options. Dual Element modes (corrosion inspections) include: Pulse-Echo (pits & flaws), Echo-Echo (thru-paint) & Pulse-Echo w/coating (combo). Our Single Membrane probe option uses a Triple-Echo (TCG) mode for coated and uncoated general applications. While not suitable for blind surface corrosion inspections, this option offers good linearity for general purpose applications.

The calibration section contains 8 common pre-programmed material types and 1 custom user programmable option. UMX-2 stores up to 5,000 readings in a variety of configurations. The file structure options include: sequential with auto identifier and alpha numeric grid formats. Every measurement stored also saves a copy of the UMX-2 current settings, along with an A-Scan waveform graphic.



UMX-2 is an underwater ultrasonic thickness gauge that measures with extreme versatility. It has the ability to simultaneously measure coatings and material thicknesses while maintaining the ability to locate pits, flaws and defects in the material. It can also use a combination of dual and single element transducers, depending on the application requirements. Based on the same operating principles as SONAR, the UMX-2 is capable of measuring the thickness of various materials with accuracy as high as ± 0.001 inches, or ± 0.01 millimeters. The principle advantage of ultrasonic measurement over traditional methods is that ultrasonic measurements can be performed with access to only one side of the material being measured.

The UMX-2come as a complete kit, ready to use, and is backed by 3 year limited warranty.

Applications: Coating and Thickness measurement using FPGA technology.

Features: Measurement modes: Dual Element - Pulse-Echo, Pulse-Echo w/Coating, Echo-Echo. Single Element - Triple-Echo (TCG). Automatic: probe zero and probe recognition.
Data storage formats: Alpha numeric grid and sequential w/auto identifier.

Windows PC software included


1.5 lbs (0.680kg) - with 3 AA batteries.

Length (9.0 in/229 mm)
Diameter (2.375 in/60.33 mm)

Operating Temperature:
-20° to 140°F (-29° to 60°C).

Single button, magnetically coupled switch.

Underwater Case:
High strength transparent plastic housing. Depth rating of 1000 feet (300 meters).

Data Output:
Bi-directional RS232 serial port, with USB converter. Windows® PC interface software.

1/2in (12.7mm) 4.5 digit LCD display.
3/8in (9.5mm) 6 alpha LCD display.
Both displays backlit (on/off/auto).

Ultrasonic Specifications

Measurement Modes:
Dual Element Probes
Pulse-Echo (P-E):
Coating Off.

Pulse-Echo Coating (PECT): Coating On

Echo-Echo (E-E): Thru-Paint.

Single Element Probes
Triple-Echo (TCG):

Dual square wave pulsers.

Dual receivers - manual or AGC gain control with 110dB range (limited).

25 MHz TCXO with single shot 100 MHz 8 bit ultra low power digitizer.

Power Source

Three 1.5V alkaline or 1.2V NiCad AA cells.

Continuous operation

Backlight Off:
Typically operates for 50 hours on alkaline and 15 hours on NiCad

Backlight On:
Typically operates for 15 hours on alkaline and 8 hours on NiCad.

(Charger not included.)

Auto power off if idle 5 min.

Battery status displayed on power up.



Pulse-Echo Mode (P-E): (Pit & Flaw Detection) measures from 0.025 19.999 inches (0.63 to 500 millimeters).

Pulse-Echo Coating Mode (PECT): (Material, Coating, Pit & Flaw Detection): Material: 0.025 to 19.999 inches (0.63 to 500 millimeters). Coating: 0.001 to 0.100 inches (0.01 to 2.54 millimeters).

Echo-Echo Mode (E-E): Thru Paint &
Coatings) measures from 0.100 to 4.0 inches (2.54 to 102 millimeters). Range will vary +/- depending on the coating.

Triple-Echo Mode (TCG): Thru Paint & Coatings) measures from 0.040 to 6.0 inches (1 to 150 millimeters) in steel. Range will vary based on coating thickness, material type, and probe.

Resolution: +/- .001 inches (0.01 mm)

Velocity Range:
.0492 to .5510 in./µs 1250 to 13995 meters/sec

Units: English & Metric

8 fixed and 1 programmable
Material Velocities (in/µs):
1. Aluminum 2024 - .251
2. Steel 4340 - .233
3. Stainless Steel 302 - .223
4. Iron - .232
5. Cast Iron - .180
6. PVC - .094
7. Polystyrene - .092
8. Polyurethane- .070
9. Custom User


Segmented Displays:

4.5 Digit LCD - Primary Measurement display.

6 Character LCD - Display menu options.

Repeatability Bar Graph Bar graph indicates stability of reading.

Data Logger (Internal)

File Formats:
Grid (alphanumeric)
Sequential (auto identifier)

Storage capacity of 1 file template. Size and dimension specified by the user.

Storage Capacity:
5,000 readings, settings, and waveform graphics.

Memory: 32 megabit non-volatile ram.


Auto Probe Zero:
Applies to dual element probes only.

Transducer Types:
Dual Element 1 to 10 MHz frequency range. Custom auto recognition probes. (Flaw & pit detection).

Single Element:
1 to 10MHz frequency range (general purpose).

LEMO underwater connectors.

Standard 4 foot cable.

Custom transducers and cable lengths available for special


Factory calibration:

traceable to national standards.

IP68 rating


3 year limited


For more information about Ultrasonic Thickness Gauge - UMX-2, please call us at 1.877.884.8378 or Click the button below.