For the viewing of paper surfaces, plate grains and prints, a binoculoar microscope with magnification of 20 is the most suitable.

• 可供应用的显微镜，有单管的(用单眼观看)和双管的(用双眼观看)两种。观察纸面，印版颗粒和印刷品，用一部20倍的显微镜，最为适当。