制作一台全息照相显影密度仪，该仪器在暗室中，显示清晰，使用方便，对提高工作效率，节省材料，制作优良的全息图有很好作用。
The instrument has features of clear digital display and easy operating in dark room. It raises working efficiency, saves material, and has good effect on taking fine hologram.
制作一台全息照相显影密度仪，该仪器在暗室中，显示清晰，使用方便，对提高工作效率，节省材料，制作优良的全息图有很好作用。
The instrument has features of clear digital display and easy operating in dark room. It raises working efficiency, saves material, and has good effect on taking fine hologram.
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