The TT100 Low Cost Ultrasonic Wall Thickness / Material Thickness Gauge is a handheld, microprocessor-controlled thickness gauge for measuring metallic and non-metallic materials, including aluminium, titanium, plastics, ceramics and glass, as long as the material conducts ultrasound and has parallel top and bottom surfaces. It is now discontinued. Because it measures from one side, it is suited to checking pipes and pressure vessels for thickness loss from corrosion, where the back surface cannot be reached.

The TT100 measures from 1.2 to 225.0mm, probe dependent, with a resolution of 0.1 up to 99.9mm and an accuracy of plus or minus 1% of material thickness plus 0.1mm. The sound velocity range is 1000 to 9999m/s, and after a simple calibration to a known thickness or velocity the gauge gives fast readings in millimetres on a 4-digit LCD. Sound velocities for five materials can be pre-set and ten readings stored in memory. Non-linear automatic compensation, coupling status indication and low-voltage warning support reliable field use, and auto power off conserves the two AA alkaline cells, which give around 250 hours per set.

The standard 5MHz probe has a 12mm tip and a minimum pipe size of 20 x 3mm, with optional probes for thin materials, thick rough-surfaced materials and high temperatures up to 300 degrees C. The unit measures 126 x 68 x 23mm, weighs 170g and works from -5 to 40 degrees C. As this model has been discontinued, contact BAMR, South Africa's authorised distributor, for a current replacement recommendation.