1. Composition of light box and operating position
1.1 Light box is made of matte black board , same type as grading backdrop equipment
1.2 Size of light box is 41 cm wide, 41 cm long, 42 cm high , with 11-cm-high shield.
1.3 The inspection light source in the box is circular tube if fluorescent 30 W with has approximately 900 – 1300 Lux
1.4 Set the light box on the approx. table 75-80-cm-high.
1.5 The Operator/inspector/observe have to look down with an inclination angle of 60 degrees and also perform on the chair which the height is 60 cm.
1.5 The lens is positioned at the angle of approximately 60 degrees to the eyes of observer who operate their inspection on the approx. 60-cm-high chair.