This is an automatic system that irradiates a laser beam from the tip of a probe inserted inside the pipe on the inner surface of the pipe and the internal bore, and accurately measures the decrease in wall thickness and expanding corrosion from the reflected laser beam.

(1) Detailed scanning of pipe internal conditions is possible.
(2) Uses 4 kinds of probes to cope with pipes of various diameters.
(3) Measurement pitch in the axial direction may be changed according to the measurement speed.

Laser accuracy is ±0.02 mm and error in measurement pitch, remaining wall thickness value calculations, pipe flatness and outside surface corrosion is approximately ±0.2 mm from the aspect of the system.