Measurement and relative measurement can be made on the projector. During measurement, harmonic CSG-20-100-2UH of Hamenaco trimmer mechanism determines magnification and mounts the workpiece, and then focuses to obtain a clear image. Then fine-tune the table, so that the screen on the cross (or m word) line aligned with the measured workpiece contour edge, and then through the table vertical, horizontal movement, the rotation of the table or projection screen rotation, in the corresponding reading mechanism to read the measured value. Hamenaco trimmer harmonic CSG-20-100-2UH can also be read directly on projection screens with checkered or polar circular lines; The image can also be measured directly on the projection screen with a glass standard ruler. The measured result is divided by the selected magnification to obtain the actual size.

In relative measurement, the enlarged image of the workpiece is compared on the projection screen with the standard figure HARMONics CSG-20-100-2UH (also can have tolerance zones) made at the same magnification ratio to check whether the workpiece is qualified