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Extech TKG150: Digital Ultrasonic Thickness Gauge/Datalogger

Compact rugged meter for non-destructive thickness measurements

The TKG150 is a Digital Ultrasonic Thickness Gauge/Data logger. Compact rugged meter for non-destructive thickness measurements. Extech offers Thickness Gauges designed in compact, handheld, rugged housing ideal for field use. The ultrasonic technology allows for non-destructive thickness measurements for primarily steel structures. Complete with protective holster, 2oz bottle of coolant, 2 AA batteries, 5MHz Transducer, hard carrying case, USB cable and Exporter software.



  • Wide measurement range:
    • 5MHz probe: 0.040″ to 20″ of steel
    • 10MHz probe: 0.020″ to 20″ of steel (optional)
  • Sunlight readable dot-matrix display with backlight
  • 100K internal datalogger with export to Excel
  • Echo to Echo option to reduce coating errors
  • B-scan (visual cross section of test piece)
  • Vibrates on alarm
  • Multiple transducer options for high temperature and difficult to measure materials
  • Fast minimum feature to capture minimum thicknesses
  • Complete with protective holster, 2oz bottle of couplant, 2 AA batteries, 5MHz Transducer, hard carrying case, USB cable and XPorter software


Specifications Range
Steel Thickness Range 5MHz probe: 0.040 to 20″ (1.0 to 508mm); 10MHz probe: 0.020 to 20″ (0.50 to 508mm)
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; illuminae flashing display and keypad; and vibration feedback
Illuminating Keypad F1 = Red, F2 = Yellow, F3 = Green for easy, go/no-go testing
Gain – Variable adjustment Low, Standard, High
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.
Rectification Modes
Live Waveform (A-Scan)
Battery Life Up to 50 hrs (20hrs w/backlighting)


TKG100_TKG150_TKG250dataEnglish Datasheet

TKG100_TKG150_UMEnglish User’s Manual

TKG-Series_QSEnglish Quick Start Guide

TKG150_CECE Declaration of Conformity