This article takes the differences between contact and non-contact methods in industrial measurement as a starting point. Proceeding from an analysis of PMT portable measuring arms and laser scanning for measuring arms, it elaborates on the the working principles, accuracy, speed, and specific application scenarios of each inspection method. From high-precision geometric inspection to complex surface digitization, PMT delivers flexible and efficient solutions that empower manufacturers to elevate quality control through professional measurement expertise, robust hardware, and intelligent software.