Ultrasonic Thickness Gauges


Extech Instruments announces versatile TKG Series of ultrasonic thickness gauges are now available. The TKG Series – consisting of the TKG250, TKG150 and TKG100 models – uses ultrasonic technology to capture non-destructive thickness measurements on various engineered materials, typically to measure wall thicknesses in steel structures where only one side is accessible to take inspection measurements. The most common applications are to detect thinning areas and corrosion build up in steam lines, boiler tubes, storage tanks, and pressure vessels. Designed and made in the USA, TKG gauges are also used to measure thicknesses on metal components found on aircraft sections, ship hulls and marine systems, heavy equipment & construction vehicles, and bridge structures. Quality control applications beyond metals include castings, plastics, composites, fiberglass, ceramics, and glass.

Innovative Design – Made in the USA

Some of the key advantages of the TKG Series include its compact design, one-handed controls, intuitive interface, easy-to-read LCD display, and versatile alarm settings. The user-friendly design makes it easier for users to master any of the TKG model’s more-advanced features, such as the user-configurable Fast Minimum/Maximum threshold settings, which, combined with Vibration feedback and Visual flashing alarms, are designed to reduce the likelihood of missing critical thickness parameters.

Features Overview

  • Measures wide thickness range – 0.040 to 20"
  • Quickly displays Min/Max thickness values
  • Offers various visual & audible alerts
  • Auto-zero upon unit start-up 
Benefits Overview
  • Compact & heavy duty
  • Easy-to-read display
  • Intuitive controls
  • Long battery life 


  • compact design
  • one-handed controls
  • intuitive interface
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