His goniometer is unprecedentedly adept at measuring interior angles--where previously available apparatuses would take an hour to make such measurements, Liu's can finish the job in a minute.
以量內角為例，以往用其他儀器測量需要一個鐘頭，用他設計的儀器卻不到一分鐘即可完成。對自己有了信心，又在國內「金頭腦發明展」、「全國發明展」中得到肯定，劉保伸決定向國外進軍，爭取國際上的進一步認可。