DDM-3020 Dynamic instrument for Outer Diameter Measuring Control is new generation of instrument for outer diameter measuring control of our company. It employs such new technology and as high speed pulse IR light source, high precision CCD computer digital image processing and features high precision, good stability, long service time, high scan rate and excellent dynamic performance. DDM-3020 has a structure that integrates measurement, display and control into one body. It is easy to mount and use the instrument. DSP-3S/3D Diameter Display is used in combination with DDM Diameter Measurement/Control System to give remote display of diameter measurement.