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  • Measurement ranges:
    • 5MHz probe: 0.040" to 20" of steel
    • 10MHz probe: 0.020” to 20" of steel (optional)
  • Sunlight readable dot-matrix display
  • Multiple transducer
  • On screen display of 8 languages
  • Fast minimum feature to capture minimum thicknesses
  • Splash-proof (IP54), high impact, compact housing
  • Sun light readable
  • Battery life: up to 50 hrs (20hrs w/backlighting)

The Extech TKG100 Ultrasonic Thickness Gauge is designed in compact, handheld, rugged housing ideal for field use. The ultrasonic technology allows for non-destructive thickness measurements for primarily steel structures. The hold mode retains the last thickness reading with reverse video display. The freeze mode freezes the display which is ideal for high temperature readings. The TKG100 beeps and flashes the display as well as keypad illumination.

The Extech TKG100 Ultrasonic Thickness Gauge applications include:

  • Boiler tubes
  • Pressure vessels
  • Storage tanks
  • Ship hulls
  • Containers
  • Home oil tanks
  • Pipes
  • Steam lines
  • Compressors
  • Shafts
  • Bridge pins
  • Bond inspection


Extech TKG-B Carrying Case
Carrying case for the TKG series


Please consider these optional accessories.

Extech TKG-C Replacement Couplant
Replacement couplant for TKG series
Extech TKG-CAL Calibration Block
Calibration block for the TKG Series
Extech TKG-H Holster
Holster for TKG Series
Extech TKG Replacement Probes
5MHz (TKG-P5) and 10MHz (TKG-P10) replacement probes for TKG thickness gauges