The portable engineering auxiliary apparatus for  remotely the measurement cracks of  the bridge base  is based on the patent for the invention of  the method of measuring cracks at long distances and their equipment. It uses four laser spots projection positioning technology and computing image app solving technology, capable of shooting cracks andimmediate image analysis from a distance, with high accuracy and security. Android mobile version is lightweight and practical, suitable for the general public at home; SLR version of the measurement accuracy is high, suitable for professional inspectors for business use. Its operation is simple and fast, for the housing safety identification and bridge crack detection of the measuring tools; The uniqueness, difference and marketability of the invention also obtain the Taipei International Invention and Technology Trade Fair, Platinum Gold Award in 2015, and transfer the patent technology authorization to private manufacturers in 2020.

The application of laser projection square space 4 reference points, and can read the projection device rotation and pitch angle, and then for shooting and spatial image analysis and then crack calculus processing, the user does not need to go to the scene close measurement or placement of reference objects, with safety and convenience.

This technique can remotely observe the 0.2mm width of the crack at  far more 25 meters away; Those application range observation and quantification data from home exterior walls and indoor wall cracks, cracks in highways and fast road bridges, cracks in high-speed and high-speed rail elevated cement structures, tunnel surface cracks, etc. This technology has been obtained Taiwan Patent and US Patent, also with Taiwan and the United States region patent exclusivity to ensure the competitiveness of foreign markets.