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Home  >>  Products  >>  Measuring Instruments  >>  Ultrasonic Thickness Gauge

Ultrasonic Thickness Gauge

UltraSonic Gages UltraSonic GagesTransducer

The TKG Series Thickness Gauges, designed in compact, handheld, rugged housing are ideal for field use. The ultrasonic technology allows for non-destructive thickness measurements for primarily steel structures.

Select models with digital thickness readout or live color waveform and datalogging function.




  • Wide measurement range:
    • 5MHz Transducer: 0.040" to 20" of steel
    • 10MHz Transducer: 0.020" to 20" of steel (optional)
  • Multiple transducer options for high temperature and difficult to measure materials
  • Fast minimum feature to capture minimum thicknesses
  • On screen display of 8 languages
  • Splash-proof (IP54), high impact, compact housing
Model TKG100 &TK150 Additional
  • Sun light readable dot-matrix display with backlight
Model TKG150 Additional Features
  • Echo to Echo option to reduce coating errors
  • 100K internal datalogger with export to Excel
  • B-scan (visual cross section of test piece)
  • Vibrate on alarm
Model TKG250 Additional Features
  • Color LCD display shows red, yellow and green visual alarm indication
  • Live Waveform (A-scan for thickness verification)
  • File compare feature as a real time corrosion monitor
  • Dynamic change of waveform color on alarm
  • Grid review of saved readings
  • Echo to Echo option to ignore coatings
  • 100K internal datalogger with export to Excel
  • B-scan (visual cross section of test piece)
  • Vibrating alarm indication



Technical Data

Technical Data
Common Functions Description
Thickness Range (in Steel): 5MHz Transducer: 0.040 to 20" (1.0 to 508mm)
10MHz Transducer: 0.020 to 20" (0.50 to 508mm) (optional)
Material Velocity Calibration Range: 0.200 to 0.7362 in/µS (0.508 to 18.699mm/µS)
Languages: English, French, Spanish, Italian, Czech, German, Portuguese, Slovak, Finnish, and Hungarian
Hold Mode: Holds display to retain last thickness reading with reverse video display
Freeze Mode: Freezes display (ideal for high temperature readings)
Fast Min/Max Mode: Displays Min or Max and actual thickness value at 20 measurements/sec
Units: Inches/Millimeters/Microseconds
Alarms: Audible beeping; illuminate flashing display and keypad; and vibration feedback (only on the TKG150/TKG250 models)
Illuminating Keypad: F1 = Red, F2 = Yellow, F3 = Green for easy, go/no-go testing
Additional Functions Model TKG100 Model TKG150 Model TKG250
Gain-Variable Adjustment: - Low, Standard, High In 1dB steps from 20-90dB or Automatic Gain Control
(AGC) for waveform
B-Scan-Displays a cross
section of the test piece:
- Displays a visual cross section of inspection area with no correlation to distance. B-Scan alarm colors consist of: Red = below minimum/above maximum; Yellow = Caution; and Green = Good.
Echo to Echo: - Measure the metal thickness only (paint & coatings do not affect base material thickness value)
Differential Mode: - Displays the difference from the actual thickness measurement and a user entered reference value
Velocity Mode: - Displays acoustic sound speed to measure thickness of unknown materials
Datalogger: - Stores 50k readings (expandable to 100k) and 5,000 waveforms; file names up to 20 characters long; and the included Extech XPorter software extracts .csv data files that can be opened for viewing in MS Excel, Notepad, or Wordpad. TKG250 also has file compare & grid review features.
Range: - - Adjustment of manual range control or auto zoom tracking to center echoes independent of selected range
Rectification Modes: - - RF, Half Wave Positive, Half Wave Negative and Full Wave Rectification
Live Waveform (A-Scan): - - Full adjustments for gain in 1dB step or AGC, main bang blank, blank after first received echo, range including zoom auto tracking to center echoes independent of material and rectification
Battery Life: Up to 50 hrs (20hrs w/ backlighting) 8 to 14hrs (depends on operating conditions)


Model TKG250 Color Screen Displays

Screen 1 Screen 2 Screen 3

Alarm Warning Screen

B-Scan Screen

Normal Screen-No Alarm
Screen 4 Screen 5 Screen 6

Change Color on Alarm

Differential Screen

RF Waveform Screen



  • Boiler Tubes
  • Pressure Vessels
  • Storage Tanks
  • Ship Hulls
  • Bond Inspection
  • Bridge Pins
  • Containers
  • Home Oil Tanks
  • Pipes
  • Steam Lines
  • Compressors
  • Shafts



Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices

All models include 2oz bottle of couplant, 2 AA batteries, Transducer (5MHz, 0.375" diameter) with potted cable, and hard case, plus a certificate of calibration to NIST.

TKG150 and TKG250 also include protective holster, USB cable, and Extech XPorter software
WT-401100 TKG100 $1,601.00
WT-401150 TKG150 2,781.00
WT-401250 TKG250 3,528.00
WT-402111 Calibration Block 357.00
WT-402113 Replacement Couplant 38.00
WT-402115 Protective Holster 119.00
WT-402117 Replacement Transducer 5MHz 430.00
WT-402119 Optional Replacement Transducer 10MHz 535.00
Additional accessories available. Please call for pricing


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