351C optical density meter

Optical density (OD) is defined as a characterization of a material's light-shielding capability; it has no dimensional unit and represents a logarithmic value. The concept of optical density was originally introduced in the field of the photosensitive properties of photographic films and photographic paper (specifically, the relationship between exposure dose and optical density). Today, it is widely applied in the optical analysis and testing of materials such as photographic films, printing and packaging materials, photoresist inks, and reflective films.

Optical density (Dmax & Dmin) measurement of printing & PCB films to verify the correctness and stability of developing processes.
Light shielding performance characterization for Black Matrix and Bezel Patterns of advanced LCD panels.
Testing coating thickness and uniformity of aluminum plastic packaging films.
Optical density quality control for raw inks used in screen printing.
Optical density-based performance assessment of directional reflective optical films for PV modules.

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