The FD800DL/FD800DL+ Corrosion and Flaw Gauge are combined corrosion gauges and flaw detectors that measures with extreme versatility.

When the GAUGE function is set to THICKNESS GAUGE, the FD800DL/FD800DL+ becomes a Corrosion Gauge which has the ability to measure coatings and material thickness simultaneously while maintaining the ability to locate pits, flaws and defects in the material. Based on the same operating principles as SONAR, the FD800DL/FD800DL+ Corrosion and Flaw Gauge is capable of measuring the thickness of various materials with accuracy as high as ± 1% or ± 0.1 millimetres (± 0.005 inches) whichever is the greater.

When the GAUGE function is set to FLAW DETECTOR, the gauge becomes a Flaw Detector which has the ability to detect the size and position of flaws and to differentiate between flaw types in various materials and welded joints. The principal advantage of ultrasonic thickness measurement over traditional methods is that ultrasonic measurements can be performed with access to only one side of the material being measured. The gauges include a data-logging (memory) facility which allows readings and waveforms to be stored in batches before being downloaded to a computer.