**7.2 Thickness**

Micrometre screw gauges or calibrated digital Vernier Callipers are used to determine the thickness of the film. The film thickness should be in the range of 5–200 μm. The thickness of the film should be measured at five distinct sites (four corners and one in the middle), and consistency in the thickness of the film is critical because it affects the accuracy of dosage distribution in the film [65].
