Product Description
Technical Specification
Instruction Manual
Data Sheet

UG20DL Underwater Thickness Gauge

The UG20DL is an underwater material and coating thickness gauge ideal for offshore inspections.

Waterproof to a depth of 300 metres (1,000 feet) the UG20DL offers many features and benefits of the CG100 series in an easy to use brightly lit gauge.

Offering both dual & single element transducers the UG20DL's memory allows users to store up to 5,000 individual readings, together with the A-Scan waveform which can be downloaded to the data management software for further analysis on dry land.


UG20DL Thickness Gauge


  • 300 metre (1000 ft.) depth rating
  • Single membrane & dual element probe transducers
  • Automatic probe recognition & zero function
  • Pulse-Echo, Pulse-Echo w/Coating, Echo-Echo, Echo-Echo Verify
  • Data Storage: Alpha Numeric & Sequential w/ID
  • Data output and storage: 5,000 readings
  • Download to ElcoMaster® data management software

Select a transducer


Pulsed Echo (P-E) Measurement Mode Echo Echo (E-E) Measurement Mode Echo Echo Verify (EEV) Measurement Mode Pulsed Echo Coating Thickness (PECT) Measurement Mode Automatic Gain Control (AGC) A-Scan Display Mode 


UG20DL Features Explained


Repeatability / Stability Indicator
Consisting of 6 vertical bars, when all the bars are fully illuminated and the last digit on the digital thickness value is stable, the gauge is reliably measuring the material thickness.

V-Path CorrectionV Path Correction

Dual element transducers consist of a probe with two crystals (one to transmit and one to receive the sound pulse). The crystals are separated by an acoustic barrier - generating a 'V-shaped' sound path as the sound travels from one element to the other.
This path is slightly longer than the direct path therefore V-path correction is used to calculate the correct thickness.


UG20DL Measurement Modes Explained


Pulse - Echo Mode (PE):
The normal display mode, measures the total thickness from the base of the transducer probe to the material density boundary (typically the back wall). Ideal for pit and flaw detection.

Echo - Echo Mode (EE):
Also known as the ThruPaint™ Mode, EE ignores the coating thickness, displaying the material thickness from the top surface of the material to the material density boundary.

Pulse - Echo Coating Mode (PECT):
Displays both the material thickness (PE) and the coating thickness (CT) at the same time.

Echo - Echo Verify Mode (EEV):
The echo-echo verify mode measures by comparing the values between 3 reflections and is commonly used to eliminate errors from surface coatings and to make measurements in multiple layered materials. 

UG20DL Display Modes Explained


Material Thickness Digits Display:
The standard display on all models, this displays the numerical thickness value in either millimetres (MM) or inches (IN).

A-Scan Display; Full Wave (RF):
The A-Scan display shows the sine wave created by the reflected sound, or oscillation, from the material being measured. In RF mode the full wave form is displayed.

A-Scan Display; Rectified (+ or -):
Users can select to view either the positive or the negative cycle of the full waveform (RF). This rectified (RECT) display shows the amplitude of the echo versus the transit time.

UG20DL Underwater Thickness Gauge

Technical Specification

Model & Part Number UG20DL
Material thickness digits display

Measurement Mode

Dual Element: PE, EE (ThruPaint™), PECT
Single Element: EEV (ThruPaint™)

Measurement Rate Manual: 4 readings per second
Measurement Range PE: 0.63 - 508mm (0.025 - 19.999 inches)
EE: 2.54 - 102mm (0.100 - 4.000 inches)
PECT: 0.63 - 508mm (0.025 - 19.999 inches)
PECT: 0.01 - 2.54mm (0.001 - 0.100")
EEV: 1.00 - 150mm (0.040 - 6.000 inches)
Measurement Accuracy

0.01mm (0.001")

Measurement Resolution 0.01mm (0.001 inch)
Velocity Calibration Range 1250 - 13,995m/s (0.0492 - 0.5510in/ms)
    A-Scan Stored in memory with each reading for review on PC
    Calibration setups 1 user programmable & 8 pre-calibrated velocities for:
aluminium, cast iron, iron, PVC, polyurethane, polystyrene, stainless steel & steel
    Waterproof - depth ratings Maximum depth 300 metres (1,000 feet) - equivalent to IP68
Pulser type Dual square wave pulsers
Gain Automatic gain control (AGC) with 100dB range,
or selectable gain: vlow, low, medium hi or vhi
Timing Precision 25MHz TCXO with single shot
100MHz 8bit ultra low power 8 bit digitizer
Data logging
  • 5,000 with A-scan image & gauge settings in one batch
  • sequential and grid logging
  • alpha numeric batch identification
Calibration Options Velocity & material type
Transducer Probe Type Dual and single element
Transducer Frequency Range 1 - 10MHz
Transducer recognition Custom automatic (dual transducers) & manual - selectable from a list
V-path / dual path error correction Automatic
Probe Zero Automatic (dual transducers) & manual (via integrated probe disk)
Display 12.7mm (1/2") 4.5 digit LCD
Display Refresh Rate 25Hz
Units (selectable) mm or inches
Backlight on / off / auto
Repeatability / Stability Indicator

Battery Type 3 x AA alkaline
Battery Life (approximate) 50 hours on alkaline and 20 hours on NiCad (backlight off).
15 hours on alkaline and 8 hours on Nicad (backlight on)
Low Battery Indicator

Battery Save Mode Auto
Operating Temperature -29 to 60ºC (-20 to 140ºF)
Size (length x diameter) 229.0 x 60.33mm (9.0 x 2.4 inches)
Weight (including batteries) 680g (24.0oz)
Case design High strength transparent plastic housing with
single, magnetically coupled, multifunction switch
Transducer connctor type LEMO underwater connectors
Interface USB
Packing List Elcometer NDT UG20DL gauge, couplant, carry case, user manual, test certificate,
3 x AA batteries, ElcoMaster® software, transfer cable, spare gaskets and lubrication set



Underwater Gauge Transducers  
Underwater Gauge Transducers are both single and dual element transducers designed for use with the UG20 Underwater Thickness Gauge and are ideal for offshore inspections. Underwater Gauge Transducer 



Connector Type

Suitable for measuring

Part Number








Lemo - UW4












2.25 MHz Underwater Transducers



Si/El Membrane





3.50 MHz Underwater Transducers







5.00 MHz Underwater Transducer    



Si/El Membrane













Underwater -

15m (50ft)




4 - Lemo UW - Lemo Underwater Connection


Cables & Adaptors  
TL-24030-4 T/Cable: 4' Single Lemo UW to Lemo UW
TL-24031 RS232 Cable (6'); DB-9 to Lemo
TL-24032 USB to Serial Adapter
TC-24034-6 Underwater Gasket Lubricant, 6g
Other Accessories  
TZ-24037 O-Ring Kit (1 Lubricant & 2 Gaskets)